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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html lang="en" dir="ltr"><head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>Programmable HTTP Caching and Serving</title>
    <meta name="revision" content="$Id: Overview.html,v 1.5 2011/03/29 14:19:54 mike Exp $">
    
    
    
    
    <!--[if IE]>
    <style type='text/css'>
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    <style type="text/css">
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  <style type="text/css">
/*****************************************************************
 * ReSpec CSS
 * Robin Berjon (robin at berjon dot com)
 * v0.05 - 2009-07-31
 *****************************************************************/


/* --- INLINES --- */
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</style><link href="DataCache.css" rel="stylesheet" type="text/css" charset="utf-8"><link href="http://www.w3.org/StyleSheets/TR/W3C-WG-NOTE" rel="stylesheet" type="text/css" charset="utf-8"></head>
  <body style="display: inherit; "><div class="head"><p><a href="http://www.w3.org/"><img width="72" height="48" src="http://www.w3.org/Icons/w3c_home" alt="W3C"></a></p><h1 class="title" id="title">Programmable HTTP Caching and Serving</h1><h2 id="w3c-working-group-note-29-march-2011">W3C Working Group Note 29 March 2011</h2><dl><dt>This version:</dt><dd><a href="http://www.w3.org/TR/2011/NOTE-DataCache-20110329/">http://www.w3.org/TR/2011/NOTE-DataCache-20110329/</a></dd><dt>Latest published version:</dt><dd><a href="http://www.w3.org/TR/DataCache/">http://www.w3.org/TR/DataCache/</a></dd>
<dt>Previous version:</dt><dd><a href="http://www.w3.org/TR/2010/WD-DataCache-20100114/">http://www.w3.org/TR/2010/WD-DataCache-20100114/</a></dd><dt>Editor:</dt><dd><a href="mailto:nikunj@o-micron.com">Nikunj Mehta</a>, Invited Expert</dd>
</dl><p class="copyright"><a href="http://www.w3.org/Consortium/Legal/ipr-notice#Copyright">Copyright</a> © 2011 <a href="http://www.w3.org/"><acronym title="World Wide Web Consortium">W3C</acronym></a><sup>®</sup> (<a href="http://www.csail.mit.edu/"><acronym title="Massachusetts Institute of Technology">MIT</acronym></a>, <a href="http://www.ercim.eu/"><acronym title="European Research Consortium for Informatics and Mathematics">ERCIM</acronym></a>, <a href="http://www.keio.ac.jp/">Keio</a>), All Rights Reserved. W3C <a href="http://www.w3.org/Consortium/Legal/ipr-notice#Legal_Disclaimer">liability</a>, <a href="http://www.w3.org/Consortium/Legal/ipr-notice#W3C_Trademarks">trademark</a> and <a href="http://www.w3.org/Consortium/Legal/copyright-documents">document use</a> rules apply.</p><hr></div>
    <div id="abstract" class="introductory section"><h2>Abstract</h2>
      <p>
        This document defines APIs for off-line serving of requests to HTTP resources using
        static and dynamic responses. It extends the function of application caches defined in 
        HTML5.
      </p>
    </div><div id="sotd" class="introductory section"><h2>Status of This Document</h2><p style="background: black; color: white; font: 900 2em serif; padding: 0.5em 1em; border: dotted yellow 0.5em; text-align: center">Beware.
        This specification is no longer in active maintenance and the
        Web Applications Working Group does not intend to maintain it further.
</p><p><em>This section describes the status of this document at the time of its publication. Other documents may supersede this document. A list of current W3C publications and the latest revision of this technical report can be found in the <a href="http://www.w3.org/TR/">W3C technical reports index</a> at http://www.w3.org/TR/.</em></p><p>This document was published by the <a href="http://www.w3.org/2008/webapps/">Web Applications Working Group</a> as a Working Group Note. If you wish to make comments regarding this document, please send them to <a href="mailto:public-webapps@w3.org">public-webapps@w3.org</a> (<a href="mailto:public-webapps-request@w3.org?subject=subscribe">subscribe</a>, <a href="http://lists.w3.org/Archives/Public/public-webapps/">archives</a>). All feedback is welcome.</p><p>Publication as a Working Group Note does not imply endorsement by the W3C Membership. This is a draft document and may be updated, replaced or obsoleted by other documents at any time. It is inappropriate to cite this document as other than work in progress.</p><p>This document was produced by a group operating under the <a href="http://www.w3.org/Consortium/Patent-Policy-20040205/">5 February 2004 W3C Patent Policy</a>. W3C maintains a <a href="http://www.w3.org/2004/01/pp-impl/42538/status" rel="disclosure">public list of any patent disclosures</a> made in connection with the deliverables of the group; that page also includes instructions for disclosing a patent. An individual who has actual knowledge of a patent which the individual believes contains <a href="http://www.w3.org/Consortium/Patent-Policy-20040205/#def-essential">Essential Claim(s)</a> must disclose the information in accordance with <a href="http://www.w3.org/Consortium/Patent-Policy-20040205/#sec-Disclosure">section 6 of the W3C Patent Policy</a>.</p></div><div id="toc" class="section"><h2 class="introductory">Table of Contents</h2><ul class="toc"><li class="tocline"><a href="#introduction" class="tocxref"><span class="secno">1. </span>Introduction</a></li><li class="tocline"><a href="#conformance" class="tocxref"><span class="secno">2. </span>Conformance</a><ul class="toc"><li class="tocline"><a href="#dependencies" class="tocxref"><span class="secno">2.1 </span>Dependencies</a></li></ul></li><li class="tocline"><a href="#terminology" class="tocxref"><span class="secno">3. </span>Terminology</a></li><li class="tocline"><a href="#cache" class="tocxref"><span class="secno">4. </span>Programmable HTTP Caching and Serving</a><ul class="toc"><li class="tocline"><a href="#datacache-intro" class="tocxref"><span class="secno">4.1 </span>Introduction</a><ul class="toc"><li class="tocline"><a href="#examples" class="tocxref"><span class="secno">4.1.1 </span>Examples</a></li><li class="tocline"><a href="#cache-events" class="tocxref"><span class="secno">4.1.2 </span>Event summary</a></li></ul></li><li class="tocline"><a href="#http-cache" class="tocxref"><span class="secno">4.2 </span>Programmable HTTP Caching</a><ul class="toc"><li class="tocline"><a href="#starting-a-transaction" class="tocxref"><span class="secno">4.2.1 </span>Starting a transaction</a></li><li class="tocline"><a href="#adding-capture-transaction" class="tocxref"><span class="secno">4.2.2 </span>Capturing resources</a></li><li class="tocline"><a href="#release-resource" class="tocxref"><span class="secno">4.2.3 </span>Releasing resources</a></li><li class="tocline"><a href="#complete-transaction" class="tocxref"><span class="secno">4.2.4 </span>Commiting a transaction</a></li><li class="tocline"><a href="#abort-transaction" class="tocxref"><span class="secno">4.2.5 </span>Aborting a transaction</a></li><li class="tocline"><a href="#datacache-api" class="tocxref"><span class="secno">4.2.6 </span>The API Entry Point</a></li><li class="tocline"><a href="#request-events" class="tocxref"><span class="secno">4.2.7 </span>Asynchronous requests</a></li><li class="tocline"><a href="#extending-the-applicationcache-interface" class="tocxref"><span class="secno">4.2.8 </span>Extending the <code>ApplicationCache</code> interface</a></li><li class="tocline"><a href="#events-and-error" class="tocxref"><span class="secno">4.2.9 </span>The <code>CacheEvent</code> Interface</a></li></ul></li><li class="tocline"><a href="#local-server" class="tocxref"><span class="secno">4.3 </span>Programmable HTTP Serving</a><ul class="toc"><li class="tocline"><a href="#request-interface" class="tocxref"><span class="secno">4.3.1 </span>Local Server Interfaces</a></li><li class="tocline"><a href="#networking-model-changes" class="tocxref"><span class="secno">4.3.2 </span>Changes to the networking model</a></li></ul></li></ul></li><li class="tocline"><a href="#security" class="tocxref"><span class="secno">5. </span>Security Considerations</a></li><li class="tocline"><a href="#acknowledgements" class="tocxref"><span class="secno">A. </span>Acknowledgements</a></li><li class="tocline"><a href="#references" class="tocxref"><span class="secno">B. </span>References</a><ul class="toc"><li class="tocline"><a href="#normative-references" class="tocxref"><span class="secno">B.1 </span>Normative references</a></li><li class="tocline"><a href="#informative-references" class="tocxref"><span class="secno">B.2 </span>Informative references</a></li></ul></li></ul></div>

    <div id="introduction" class="section informative">
      <!--OddPage--><h2><span class="secno">1. </span>Introduction</h2><p><em>This section is non-normative.</em></p>
      <p>
        The existing cache manifest [<cite><a class="bibref" rel="biblioentry" href="#bib-HTML5">HTML5</a></cite>] statically identifies cached 
        resources to be stored in an application cache.&nbsp; The API introduced
        in this document extends the application cache by allowing
        applications to programmatically add other resources to the cache
        which can then be served by the user agent when that resource is
        requested. This API also extends the application cache to enable
        applications to programmatically generate responses to requests for
        resources that have been added to the application cache. As a result,
        the application cache can now be used to satisfy unsafe HTTP methods
        such as <code>PUT</code> and <code>POST</code>.
      </p>
      <p>
        Using this application cache extension, applications can obtain locally
        cached data or data produced locally by JavaScript servers and perform
        requests on resources that can be served whether or not the user agent
        is connected to a remote server. Applications can then save and replay
        locally satisfied requests to the server when it is reconnected, thus
        enabling responsive and robust Web applications in the presence of low
        connectivity conditions.
      </p>
      <p>
        This specification does not require a new programming model for Web
        applications as application caches can be configured to be transparently
        pressed into action by the user agent, depending on system conditions.
        Such applications can seamlessly switch between on-line and off-line
        operation without needing explicit user action. This also means that 
        existing applications can be used unchanged in many cases
        once the application cache is configured. Applications only need to be
        altered to use APIs specified in this document if they require more
        complex synchronization. 
      </p>
    </div>

    <div id="conformance" class="section"><!--OddPage--><h2><span class="secno">2. </span>Conformance</h2><p>As well as sections marked as non-normative, all authoring guidelines, diagrams, examples, and notes in this specification are non-normative. Everything else in this specification is normative.</p>
<p>The key words <em class="rfc2119" title="must">must</em>, <em class="rfc2119" title="must not">must not</em>, <em class="rfc2119" title="required">required</em>, <em class="rfc2119" title="should">should</em>, <em class="rfc2119" title="should not">should not</em>, <em class="rfc2119" title="recommended">recommended</em>, <em class="rfc2119" title="may">may</em>, and <em class="rfc2119" title="optional">optional</em> in this specification are to be interpreted as described in [<cite><a class="bibref" rel="biblioentry" href="#bib-RFC2119">RFC2119</a></cite>].</p>

      <p>
        This specification defines one class of products:
      </p>
      <dl>
        <dt><dfn id="dfn-conforming-user-agent">conforming user agent</dfn></dt>
        <dd>
          <p>
            A user agent must behave as described in this specification
            in order to be considered conformant.
          </p>
          
          <p>
            User agents may implement algorithms given in this
            specification in any way desired, so long as the end result is
            indistinguishable from the result that would be obtained by the
            specification's algorithms.
          </p>
          
          <p>
            A <a href="#dfn-conforming-user-agent" class="internalDFN">conforming user agent</a> must also be a
            <em>conforming implementation</em> of the IDL fragments
            of this specification, as described in the
            Web IDL specification. [<cite><a class="bibref" rel="biblioentry" href="#bib-WEBIDL">WEBIDL</a></cite>]
          </p>
          
          <p class="note">
            This specification uses both the terms "conforming user agent(s)" 
            and "user agent(s)" to refer to this product class.
          </p>
        </dd>
      </dl>
      
      <div id="dependencies" class="section">
        <h3><span class="secno">2.1 </span>Dependencies</h3>
          
        <p>This specification relies on several underlying specifications.</p>
        <dl>
          <dt>HTML5</dt>
          <dd>The terms and algorithms 
            <dfn title="event handler" id="dfn-event-handler">event handlers</dfn>, 
            <dfn id="dfn-event-handler-event-type">event handler event type</dfn>, <dfn id="dfn-origin">origin</dfn>,
            <dfn id="dfn-same-origin">same origin</dfn>, <dfn id="dfn-fetching-resources">fetching resources</dfn>, 
            <dfn id="dfn-browsing-context">browsing context</dfn>, <dfn id="dfn-active-document">active document</dfn>,
            <dfn id="dfn-child-browsing-context">child browsing context</dfn>, <dfn id="dfn-application-cache">application cache</dfn>, 
            <dfn id="dfn-application-cache-group">application cache group</dfn>, <dfn id="dfn-relevant-application-cache">relevant application cache</dfn>, 
            <dfn id="dfn-master-entries">master entries</dfn>, <dfn id="dfn-application-cache-selection-algorithm">application cache selection algorithm</dfn>, 
            <dfn id="dfn-cache-host">cache host</dfn>, <dfn id="dfn-manifest">manifest</dfn>, <dfn id="dfn-explicit-entries">explicit entries</dfn>, 
            <dfn id="dfn-http-get-equivalent">HTTP GET equivalent</dfn>, <dfn id="dfn-task">task</dfn>, <dfn id="dfn-task-source">task source</dfn>, 
            and <dfn id="dfn-queue-a-task">queue a task</dfn>, <dfn id="dfn-storage-mutex">storage mutex</dfn>, the 
            <dfn id="dfn-manifest-1"><code>manifest</code></dfn> attribute, and the 
            <dfn id="dfn-function"><code>Function</code></dfn> and <dfn id="dfn-applicationcache"><code>ApplicationCache</code></dfn> 
            interfaces are referenced in this specification and defined by the HTML 5 
            specification [<cite><a class="bibref" rel="biblioentry" href="#bib-HTML5">HTML5</a></cite>].
          </dd>
          <dt>HTTP</dt>
          <dd>
            <p>
              A <a href="#dfn-conforming-user-agent" class="internalDFN"> conforming user agent</a> must support some version of the
              HTTP protocol [<cite><a class="bibref" rel="biblioentry" href="#bib-HTTP11">HTTP11</a></cite>].
            </p>
          
            <p>
              In order to protect against attacks, the use of the following
              headers is prohibited using interfaces defined in this specification.
            </p>
            
            <ul>
              <li><code>Accept</code></li>
              
              <li><code>Accept-Charset</code></li>
              
              <li><code>Accept-Encoding</code></li>
              
              <li><code>Accept-Language</code></li>
              
              <li><code>Authorization</code></li>
              
              <li><code>Cache-Control</code></li>
              
              <li><code>Connection</code></li>
              
              <li><code>Content-Transfer-Encoding</code></li>
              
              <li><code>Cookie</code></li>
              
              <li><code>Date</code></li>
              
              <li><code>Expect</code></li>
              
              <li><code>Host</code></li>
              
              <li><code>Keep-Alive</code></li>
              
              <li><code>Origin</code></li>
              
              <li><code>Range</code></li>
              
              <li><code>Referer</code></li>
              
              <li><code>Set-Cookie</code></li>
              
              <li><code>TE</code></li>
              
              <li><code>Trailer</code></li>
              
              <li><code>Transfer-Encoding</code></li>
              
              <li><code>Upgrade</code></li>
              
              <li><code>User-Agent</code></li>
              
              <li><code>Via</code></li>
            </ul>
          </dd>
          <dt>HTTP State Management</dt>
          <dd>
            <p>
              A <a href="#dfn-conforming-user-agent" class="internalDFN">conforming user agent</a> must support storage and
              exchange of cookies as specified by HTTP State Management 
              [<cite><a class="bibref" rel="biblioentry" href="#bib-COOKIES">COOKIES</a></cite>].
            </p>
          </dd>
          <dt>File API</dt>
          <dd>The term  
            <dfn title="Blob" id="dfn-blob"><code>Blob</code></dfn> is referenced by this
            specification and defined by the File API specification [<cite><a class="bibref" rel="biblioentry" href="#bib-FILE-API">FILE-API</a></cite>].
          </dd><dt>DOM</dt>
          <dd>
            <p>
              A <a href="#dfn-conforming-user-agent" class="internalDFN">conforming user agent</a> must define the exception codes
              <dfn id="dfn-invalid_state_err"><code>INVALID_STATE_ERR</code></dfn> and
              <dfn id="dfn-not_found_err"><code>NOT_FOUND_ERR</code></dfn>, and  
              <dfn id="dfn-event"><code>Event</code></dfn> and <dfn id="dfn-domexception"><code>DOMException</code></dfn>
              interface defined in [<cite><a class="bibref" rel="biblioentry" href="#bib-DOM-LEVEL-3-CORE">DOM-LEVEL-3-CORE</a></cite>] 
              and referenced in this specification.
            </p>
          </dd>
        </dl>
      </div>
    </div>
    
    <div id="terminology" class="section">
      <!--OddPage--><h2><span class="secno">3. </span>Terminology</h2>
      <p>
        A <dfn id="dfn-managed">managed</dfn> resource is one whose URI is dynamically captured
        in an <a class="externalDFN">application cache</a>.
      </p>
      
      <p>
        A resource is <dfn id="dfn-captured">captured</dfn> when it is dynamically added 
        to an <a class="externalDFN">application cache</a>.
      </p>
      
      <p>
        A resource is <dfn id="dfn-released">released</dfn> when it is dynamically removed
        from an <a class="externalDFN">application cache</a>.
      </p>
      
      <p>
        A <dfn id="dfn-static">static</dfn> representation is one that is generated directly
        by the user agent from an <a class="externalDFN">application cache</a>.
      </p>
      
      <p>
        A <dfn id="dfn-dynamic">dynamic</dfn> representation is one that is generated 
        programmatically by using application-supplied logic
        in an embedded local server.
      </p>
      
      <p>
        <dfn title="off-line" id="dfn-off-line">Transparent off-line data access and manipulation</dfn>  
        means to locally generate a <a href="#dfn-static" class="internalDFN">static</a> or a <a href="#dfn-dynamic" class="internalDFN">dynamic</a> 
        response for HTTP requests to <a href="#event-captured" class="internalDFN">captured</a> resources.
      </p>
    </div>
            
    <div id="cache" class="section">
      <!--OddPage--><h2><span class="secno">4. </span>Programmable HTTP Caching and Serving</h2>

      <p>
        Programmable HTTP processing enables applications to identify
        <a href="#dfn-managed" class="internalDFN">managed</a> resources to a user agent and to produce <a href="#dfn-static" class="internalDFN">static</a> 
        and <a href="#dfn-dynamic" class="internalDFN">dynamic</a> representations for responding to requests on
        these resources. 
      </p>
        
      <div id="datacache-intro" class="section informative">
        <h3><span class="secno">4.1 </span>Introduction</h3><p><em>This section is non-normative.</em></p>     

        <p>  
          A user agent processes network requests to <a>managed resources</a>
          in one of three ways: 
        </p>
        <ol>
          <li>
            <dfn id="dfn-serve-policy">serve policy</dfn> - respond with the <a href="#dfn-static" class="internalDFN">static</a> representation  
            of the requested resource (for any safe HTTP methods) from
            the <a class="externalDFN">application cache</a>. 
          </li>
          <li>
            <dfn id="dfn-intercept-policy">intercept policy</dfn> - 
            immediately invoke an <a href="#dfn-embedded-local-server" class="internalDFN">embedded local server</a> to obtain a 
            <a href="#dfn-dynamic" class="internalDFN">dynamic</a> representation (for any HTTP methods). 
          </li>
          <li>
            <dfn id="dfn-review-policy">review policy</dfn> - 
            relay the request to the server to obtain a <a href="#dfn-dynamic" class="internalDFN">dynamic</a>
            representation and notify an <a href="#dfn-embedded-local-server" class="internalDFN">embedded local server</a> 
            when that representation is available (only for unsafe HTTP methods). 
          </li>
        </ol>
        
        <p>
          The <a href="#dfn-serve-policy" class="internalDFN">serve policy</a> applies only to resources that do not
          require interception, whereas the <a href="#dfn-intercept-policy" class="internalDFN">intercept policy</a> can only 
          be used for resources that require interception. Both policies
          improve availability and responsiveness. However, both may affect
          data freshness. The <a href="#dfn-review-policy" class="internalDFN">review policy</a>
          can only be used when the user agent is able to communicate with
          the server. This policy improves data freshness at the cost of 
          reduced responsiveness. User agents may choose freely from among
          these options, e.g., using information about the system condition, 
          network state or battery power level, or a user preference.
        </p>
          
        <div class="section" id="examples">
          <h4><span class="secno">4.1.1 </span>Examples</h4>

          <p>
            An application can use an <a class="externalDFN">application cache</a> to 
            programmatically <a title="captured" href="#event-captured" class="internalDFN">capture</a> the representation of a 
            resource, i.e., cache an <a href="#dfn-off-line" class="internalDFN">off-line</a> representation in the 
            <a class="externalDFN">application cache</a>.  
          </p>
          
          <div class="example"><div class="exampleHeader">Example</div>    
            <p>
              An application <a>captures</a> a resource as part of an atomic 
              <a href="#dfn-cache-transaction" class="internalDFN">cache transaction</a>. Once the resource is <a href="#event-captured" class="internalDFN">captured</a> 
              successfully, the application places the <a href="#event-captured" class="internalDFN">captured</a> 
              representation in to service. This can be performed through a 
              single API call.
            </p>
            <div class="block"><div class="blockTitleDiv"><span class="blockTitle">ECMAScript</span></div><div class="blockContent"><pre class="code"><code class="es-code">var uri = ...
var cache = window.applicationCache;
// cache and immediately take advantage of the new stuff in the cache
cache.immediate(uri);</code></pre></div></div>
            <p>
              The user agent is able to then serve this <a href="#dfn-static" class="internalDFN">static</a> representation
              when an application issues a <code>GET</code> request for
              that resource either through page navigation or an XMLHttpRequest 
              [<cite><a class="bibref" rel="biblioentry" href="#bib-XMLHTTPREQUEST">XMLHTTPREQUEST</a></cite>]. 
            </p>
            <div class="block"><div class="blockTitleDiv"><span class="blockTitle">ECMAScript</span></div><div class="blockContent"><pre class="code"><code class="es-code">var req = new XMLHttpRequest();
req.open('GET', uri);
...
req.send();</code></pre></div></div>
          </div>              
          
          <p>
            A <a href="#dfn-dynamic" class="internalDFN">dynamic</a> representation is produced by using an
            <a href="#dfn-embedded-local-server" class="internalDFN">embedded local server</a> in conjunction with the 
            <a class="externalDFN">application cache</a>. An <a href="#dfn-interceptor" class="internalDFN">interceptor</a>
            processes an HTTP request locally in an <a href="#dfn-embedded-local-server" class="internalDFN">embedded local server</a>
            without changing the network APIs used by applications. Thus 
            even if a host is unreachable, applications can successfully
            make HTTP requests to a <a href="#dfn-managed" class="internalDFN">managed</a> resource.
          </p>

          <div class="example"><div class="exampleHeader">Example</div>      
            <p>
              In this example, a local request handler can produce a <a href="#dfn-dynamic" class="internalDFN">dynamic</a> 
              response  to an application request when the network is not accessible. 
              The response can be prepared using the 
              <a class="externalDFN">application cache</a>, for example. The benefit
              of this technique is that applications don't need to alter their
              applications to accommodate <a href="#dfn-off-line" class="internalDFN">off-line</a> use cases. 
              Instead, user agents can transparently introduce an application-specific 
              <a href="#dfn-off-line" class="internalDFN">off-line</a> handler to deal with situations when the network is not 
              available.  
            </p>
            <div class="block"><div class="blockTitleDiv"><span class="blockTitle">ECMAScript</span></div><div class="blockContent"><pre class="code"><code class="es-code">var uri = ...
var cache = window.applicationCache;
var local = function(request, response) {
  response.setStatus(200, 'OK');
  response.setResponseText('Hello World');
};

window.navigator.registerOfflineHandler(uri, local);

var req = cache.offline(uri, '', null, ['GET']);</code></pre></div></div>
            <p>
              Later when that application issues a <code>GET</code> request for
              the <a href="#dfn-managed" class="internalDFN">managed</a> resource either through page navigation or an XMLHttpRequest 
              [<cite><a class="bibref" rel="biblioentry" href="#bib-XMLHTTPREQUEST">XMLHTTPREQUEST</a></cite>], and the user agent is <a href="#dfn-off-line" class="internalDFN">off-line</a>, it invokes the
              <code>local</code> <a href="#dfn-off-line" class="internalDFN">off-line</a> handler which produces a <a href="#dfn-dynamic" class="internalDFN">dynamic</a> 
              response. 
            </p>
            <div class="block"><div class="blockTitleDiv"><span class="blockTitle">ECMAScript</span></div><div class="blockContent"><pre class="code"><code class="es-code">var req = new XMLHttpRequest();
req.open('GET', uri);
...
req.send();</code></pre></div></div>
          </div>              
         
          <p>
            Applications can also locally intercept requests that modify data, 
            e.g., unsafe HTTP requests such as <code>PUT</code> in an <a href="#dfn-off-line" class="internalDFN">off-line</a>
            handler. Requests to resources that are <a href="#dfn-managed" class="internalDFN">managed</a> in an 
            <a class="externalDFN">application cache</a> can be either:
          </p>
          <ul>
            <li>intercepted and served by an <a href="#dfn-interceptor" class="internalDFN">interceptor</a>, when the
            user agent is <a href="#dfn-off-line" class="internalDFN">off-line</a> or</li>
            <li>the server, when the user agent is online with a <a href="#dfn-reviewer" class="internalDFN">reviewer</a>  
          analyzing the result of the online request.</li>
          </ul>
          <p>
             A user agent can switch 
            between these two behaviors automatically based on system conditions.
          </p>
         
          <div class="example"><div class="exampleHeader">Example</div>
            <p>
              For example, an application worker script that wishes to allow <a href="#dfn-off-line" class="internalDFN">off-line</a>
              updates to <var>uri</var> <a title="captured" href="#event-captured" class="internalDFN">captures</a> that resource 
              in an <a class="externalDFN">application cache</a>.
            </p>
            
            <div class="block"><div class="blockTitleDiv"><span class="blockTitle">ECMAScript</span></div><div class="blockContent"><pre class="code"><code class="es-code">var uri = ...
var cache = self.applicationCache;
cache.immediate(uri, ['PUT']);
</code></pre></div></div>

            <p>
              Another application in the same origin could then register an <a href="#dfn-off-line" class="internalDFN">off-line</a>
              handler for the same <var>uri</var> to serve <a href="#dfn-off-line" class="internalDFN">off-line</a> requests to 
              that resource. 
            </p>
            
            <div class="block"><div class="blockTitleDiv"><span class="blockTitle">ECMAScript</span></div><div class="blockContent"><pre class="code"><code class="es-code">var cache = window.applicationCache;
var intercept = function(request, response) {
  if (...) {
    // validation fails
    response.setStatus(400, 'Bad Request');
    response.setResponseText('Request not understood');
    return;
  } 
  var type = request.headers['Content-Type'] || 'text/plain';
  var req = cache.offline(request.targetURL, request.bodyText, type);
  req.onsuccess = function() {
    response.setResponseText(request.bodyText);
    response.setResponseHeader('Content-Type', type);
    response.setStatus(200, 'OK');
  }
};

var review = function(request, response) {
  var req = cache.offline(request.targetURL, response.bodyText, response.headers['Content-Type']);
};

window.navigator.registerOfflineHandler(uri, intercept, review);</code></pre></div></div>

            <p>
              When the application makes a <code>PUT</code> request to 
              <var>uri</var> and the user agent is <a href="#dfn-off-line" class="internalDFN">off-line</a>,
              the user agent asks the <var>intercept</var> function to
              process the request and respond to it. If the user agent is online
              when the request arrives, then it sends the request to
              a host and asks the <var>review</var> function to process the
              response received from it.              
            </p>
            
            <div class="block"><div class="blockTitleDiv"><span class="blockTitle">ECMAScript</span></div><div class="blockContent"><pre class="code"><code class="es-code">var req = new XMLHttpRequest();
req.open('PUT', uri);
...
req.send(...);</code></pre></div></div>

            <p>
              If this application makes a <code>GET</code> request to 
              <var>uri</var>, then its cached <a href="#dfn-static" class="internalDFN">static</a> representation is 
              returned as the response regardless of whether the user agent is off-line.
            </p>
            
            <div class="block"><div class="blockTitleDiv"><span class="blockTitle">ECMAScript</span></div><div class="blockContent"><pre class="code"><code class="es-code">var req = new XMLHttpRequest();
req.open('GET', uri);
...
req.send();</code></pre></div></div>
          </div>
        </div>
          
        <div id="cache-events" class="section informative">
          <h4><span class="secno">4.1.2 </span>Event summary</h4><p><em>This section is non-normative.</em></p>
          
          <p>
            An application updates the <a href="#dfn-managed" class="internalDFN">managed</a> resources of an 
            <a class="externalDFN">application cache</a>. During this update, the 
            user agent will add or remove the representations of <a href="#dfn-managed" class="internalDFN">managed</a> 
            resources to and from the <a class="externalDFN">application cache</a>.
          </p>
          
          <p>
            As this is going on, a number of events get fired to keep the script  
            updated as to the state of the <a href="#dfn-cache-transaction" class="internalDFN">cache transaction</a>, so that the 
            user can be notified appropriately. The events are as follows:
          </p>
          
          <table>
            <thead><tr><th>Event name</th><th>Occasion</th><th>Next events</th></tr></thead>
            <tbody>
              <tr>
                <td><dfn id="event-captured"><code>captured</code></dfn></td>
                <td>
                  The user agent has finished <a title="fetch">fetching</a> 
                  and storing the representation of a <a href="#dfn-managed" class="internalDFN">managed</a> resource.
                </td>
                <td>
                  <a href="#event-captured"><code>captured</code></a>, 
                  <a href="#event-released"><code>released</code></a>, 
                  <a href="#event-ready"><code>ready</code></a>
                </td>
              </tr>

              <tr>
                <td><dfn id="event-released"><code>released</code></dfn></td>
                <td>The user agent has released a <a href="#dfn-managed" class="internalDFN">managed</a> resource 
                and can no longer serve <a href="#dfn-off-line" class="internalDFN">off-line</a> requests to it.</td>
                <td>
                  <a href="#event-captured"><code>captured</code></a>, 
                  <a href="#event-released"><code>released</code></a>, 
                  <a href="#event-ready"><code>ready</code></a>
                </td>
              </tr>
              
              <tr>
                <td><dfn id="event-ready"><code>ready</code></dfn></td>
                <td>The user agent has finished capturing and releasing the
                requested resources and does not have any pending 
                requests in this <a href="#dfn-cache-transaction" class="internalDFN">cache transaction</a>.</td>
                <td>Last event in sequence.</td>
              </tr>

            </tbody>
          </table>            
        </div>
      </div>
        
        <div id="http-cache" class="section">
          <h3><span class="secno">4.2 </span>Programmable HTTP Caching</h3>

          <p>
            This specification adds two new kinds of entries for
            <a class="externalDFN">application cache</a> to the various kinds
            defined in [<cite><a class="bibref" rel="biblioentry" href="#bib-HTML5">HTML5</a></cite>]:
          </p>

          <dl>          
            <dt><dfn id="dfn-static-entry">static entry</dfn></dt>
            <dd>
              A <a href="#dfn-managed" class="internalDFN">managed</a> resource whose representation is cached for 
              <a href="#dfn-off-line" class="internalDFN">off-line</a> serving. A request to a <a href="#dfn-static-entry" class="internalDFN">static entry</a>
              can only be used with the <a href="#dfn-serve-policy" class="internalDFN">serve policy</a>.
            </dd>
            <dt><dfn id="dfn-dynamic-entry">dynamic entry</dfn></dt>
            <dd>
              A <a href="#dfn-managed" class="internalDFN">managed</a> resource whose representation is produced locally 
              by an application upon request. Each <a href="#dfn-dynamic-entry" class="internalDFN">dynamic entry</a> 
              identifies one or more <dfn id="dfn-dynamic-methods">dynamic methods</dfn>
              for which a response can be obtained locally using an 
              <a href="#dfn-interceptor" class="internalDFN">interceptor</a>.
            </dd>
          </dl>
          
          <div class="note">
            Only a document with a manifest can use <a href="#dfn-managed" class="internalDFN">managed</a> resources. 
          </div>
          
          <p>
            Each <a class="externalDFN">application cache</a> has a 
            <dfn id="dfn-dynamic-completeness-flag">dynamic completeness flag</dfn>, which is either 
            <var>incomplete</var> or <var>complete</var>.
            Each <a class="externalDFN">application cache</a> whose 
            <a href="#dfn-dynamic-completeness-flag" class="internalDFN">dynamic completeness flag</a> 
            is <var>complete</var> has a <dfn id="dfn-version">version</dfn>.
            No two <a class="externalDFN">application cache</a>s in an 
            <a class="externalDFN">application cache group</a> 
            may have the same <a href="#dfn-version" class="internalDFN">version</a>. A <a class="externalDFN">newer</a>
            <a class="externalDFN">application cache</a> has a larger <a href="#dfn-version" class="internalDFN">version</a>.
          </p>
          
          <p>
            Each <a class="externalDFN">application cache group</a> has a 
            <dfn id="dfn-dynamic-update-status">dynamic update status</dfn>, which is one of the following:
            <var>idle</var> or <var>updating</var>.
          </p>
                  
          <p>
            Application scripts identify the resources <a href="#dfn-managed" class="internalDFN">managed</a> by an 
            <a class="externalDFN">application cache</a> during a <dfn id="dfn-cache-transaction">cache transaction</dfn>, 
            when applications may either <a title="captured" href="#event-captured" class="internalDFN">capture</a> or 
            <a title="released" href="#event-released" class="internalDFN">release</a> its resources. 
          </p>

          <p>
            Each <a href="#dfn-cache-transaction" class="internalDFN">cache transaction</a> has an 
            <a class="externalDFN">application cache group</a>
            and an <a class="externalDFN">application cache</a>.
          </p>
          
          <p>
            A <a href="#dfn-cache-transaction" class="internalDFN">cache transaction</a>  can be marked as 
            <dfn id="dfn-off-line-transaction">off-line transaction</dfn>.
          </p>
          
          <p>
            Each <a href="#dfn-cache-transaction" class="internalDFN">cache transaction</a> has a <dfn id="dfn-commit-status">commit status</dfn>, 
            which can be either of <var>pending</var>, <var>committed</var>, or
            <var>aborted</var>.
          </p>
          
          <p>
            When a <a href="#dfn-cache-transaction" class="internalDFN">cache transaction</a> is started, the user agent must run  
            the steps to <a href="#dfn-create-a-cache-transaction" class="internalDFN">create a cache transaction</a>. When a resource is  
            added to a transaction's list of <a href="#event-captured" class="internalDFN">captured</a> resources,   
            the user agent must run the steps to <a href="#dfn-add-a-resource-to-be-captured" class="internalDFN">add a resource to be captured</a>. 
            When a resource is added to a transaction's list of released 
            resources, the user agent must run the steps to 
            <a href="#dfn-add-a-resource-to-be-released" class="internalDFN">add a resource to be released</a>. When the transaction is finished, 
            the user agent must run either the steps to <a href="#dfn-commit-a-cache-transaction" class="internalDFN">commit a cache transaction</a>
            or the steps to <a href="#dfn-abort-a-cache-transaction" class="internalDFN">abort a cache transaction</a>.
          </p>
            
          <div class="section" id="starting-a-transaction">
            <h4><span class="secno">4.2.1 </span>Starting a transaction</h4>
            
            <p>
              When the user agent is required to <dfn id="dfn-create-a-cache-transaction">create a cache transaction</dfn> 
              given an <a class="externalDFN">application cache group</a> and an 
              off-line flag, the user agent must run the following steps:
            </p>
            
            <ol>
              <li>
                Let <var>cache group</var> be the 
                <a class="externalDFN">application cache group</a> passed to these steps.
              </li>
              <li>
                If <var>cache group</var> is marked <a>obsolete</a>, then 
                set an error and abort these steps.
              </li>
              <li>
              Pick the appropriate steps:
              <dl class="switch">
                <dt>If the off-line flag passed to these steps is set.</dt>
                <dd>
                  <ol>
                    <li>
                      Create a new <a class="externalDFN">application cache</a>, 
                      called <var>cache</var>, in <var>cache group</var>.
                    </li>
                    <li>
                      Set the <a href="#dfn-dynamic-completeness-flag" class="internalDFN">dynamic completeness flag</a> of <var>cache</var> to 
                      <var>incomplete</var>.
                    </li>
                    <li>
                      Create a new <a href="#dfn-cache-transaction" class="internalDFN">cache transaction</a> called <var>transaction</var> and
                      set <var>cache</var> to be its 
                      <a class="externalDFN">application cache</a>.
                    </li>
                    <li>
                      Mark <var>transaction</var> as <a href="#dfn-off-line-transaction" class="internalDFN">off-line transaction</a>.
                    </li>
                    <li>
                      Return <var>transaction</var>.
                    </li>
                  </ol>
                </dd>
                
                <dt>If the off-line flag passed to these steps is not set.</dt>
                <dd>
                  <ol>
                    <li>
                      Atomically, so as to avoid race conditions, perform the following sub-steps
                      <ol>
                        <li>
                          If the <a href="#dfn-dynamic-update-status" class="internalDFN">dynamic update status</a> of 
                          <var>cache group</var> is <var>updating</var>,
                          then set an error and abort these steps, as a 
                          <a href="#dfn-cache-transaction" class="internalDFN">cache transaction</a> is already open on this
                          <a class="externalDFN">application cache group</a>.
                        </li>
                        <li>
                          Set the <a href="#dfn-dynamic-update-status" class="internalDFN">dynamic update status</a> of <var>cache group</var> 
                          to <var>updating</var>.
                        </li>
                      </ol>
                    </li>
                    <li>
                      Create a new <a class="externalDFN">application cache</a>, 
                      called <var>cache</var>, in <var>cache group</var>
                      which holds all the same resources as the 
                      <a class="externalDFN">relevant application cache</a> of 
                      <var>cache group</var>.
                    </li>
                    <li>
                      Set the <a href="#dfn-dynamic-completeness-flag" class="internalDFN">dynamic completeness flag</a> of <var>cache</var> to 
                      <var>incomplete</var>.
                    </li>
                    <li>
                      Create a new <a href="#dfn-cache-transaction" class="internalDFN">cache transaction</a> called <var>transaction</var> and
                      set <var>cache</var> to be its <a class="externalDFN">application cache</a>.
                    </li>
                    <li>
                      Mark <var>transaction</var> as not <a title="off-line transaction" href="#dfn-off-line-transaction" class="internalDFN">off-line</a>.
                    </li>
                  </ol>
                </dd>
              </dl></li>
              <li>
                Set <var>transaction</var>'s <a href="#dfn-commit-status" class="internalDFN">commit status</a> to
                <var>pending</var>.
              </li>
              <li>
                Return <var>transaction</var>.
              </li>
            </ol>
          </div>
          
          <div class="section" id="adding-capture-transaction">
            <h4><span class="secno">4.2.2 </span>Capturing resources</h4>
            
            <p>
              When the user agent is required to <dfn id="dfn-add-a-resource-to-be-captured">add a resource to be 
              <a href="#event-captured" class="internalDFN">captured</a></dfn>, given the URI of the resource to 
              <a title="captured" href="#event-captured" class="internalDFN">capture</a>, a <a href="#dfn-cache-transaction" class="internalDFN">cache transaction</a>, 
              optionally a list of <a href="#dfn-dynamic-methods" class="internalDFN">dynamic methods</a>, optionally content to
              serve as the <a href="#dfn-static" class="internalDFN">static</a> representation of that resource, and
              optionally content type for that representation, the user agent
              must perform the following steps:
            </p>
            
            <ol>
              <li>
                Let <var>transaction</var> be the <a href="#dfn-cache-transaction" class="internalDFN">cache transaction</a>
                passed to these steps.
              </li>
              
              <li>
                If <var>transaction</var>'s <a href="#dfn-commit-status" class="internalDFN">commit status</a> is not
                <var>pending</var>, then set an error and abort these steps.
              </li>
              
              <li>
                Pick the appropriate sub-steps:
                <dl class="switch">
                   <dt>If the <a class="externalDFN">cache host</a> passed to
                   these steps is a <code>Document</code> object</dt> 
                  <dd>
                    Let <var>origin</var> be the <a href="#dfn-origin" class="internalDFN">origin</a> of the
                    <a class="externalDFN">cache host</a> passed to these steps.
                  </dd>
                  
                  <dt>If the <a class="externalDFN">cache host</a> passed to
                  these steps is a <code>WorkerGlobalScope</code> object</dt>
                  <dd>  
                    Let <var>origin</var> be the <a href="#dfn-origin" class="internalDFN">origin</a> of the scripts in the 
                    worker for the <a class="externalDFN">cache host</a> passed to
                    these steps.
                  </dd>
                </dl>
              </li>
              
              <li>
                Resolve the URI passed to these steps relative to <var>base URI</var>. 
              </li>
              
              <li>
                If the resulting absolute URI has a different <code>&lt;scheme&gt;</code> 
                component than the base URI (compared in an ASCII case-insensitive 
                manner), then set an error and abort these steps.
              </li>
              
              <li>
                If the resulting absolute URI does not have the 
                <a class="externalDFN">same origin</a> as <var>base URI</var>, 
                then set an error and abort these steps.
              </li>
              
              <li>
                Drop the <code>&lt;fragment&gt;</code> component of the resulting
                absolute URI, if it has one.
              </li>
              
              <li>
                Let <var>cache</var> be <var>transaction</var>'s 
                <a class="externalDFN">application cache</a>.
              </li>
              
              <li>
                If the resulting absolute URI identifies an 
                <a class="externalDFN">explicit entry</a> or 
                <a class="externalDFN">master entry</a> or the
                <a class="externalDFN"> manifest</a> of <var>cache</var>, then
                set an error and abort these steps.
              </li>
              
              <li>
                If the resulting absolute URI identifies a <a href="#dfn-managed" class="internalDFN">managed</a> resource that
                is already in <var>cache</var>, then remove that <a href="#dfn-managed" class="internalDFN">managed</a> 
                resource from <var>cache</var>.
              </li>
              <li>
                Pick the appropriate sub-steps: <dl class="switch">
                <dt>
                  If <var>transaction</var> is not marked as 
                  <a title="off-line transaction" href="#dfn-off-line-transaction" class="internalDFN">off-line</a>
                </dt>
                <dd>
                  <ol>
                    <li>
                      If the list of dynamic methods passed to these steps
                      includes the  method <code>GET</code>, then skip the
                      remaining sub-steps and store in <var>cache</var> a 
                      <a href="#dfn-managed" class="internalDFN">managed</a> resource comprising the resulting absolute 
                      URI and the list of 
                      <a href="#dfn-dynamic-methods" class="internalDFN">dynamic methods</a> passed to these steps. 
                    </li>
                    <li>
                      <a title="fetch">Fetch</a> the representation of the resource identified by the
                      absolute URI. Use the <var>transaction</var>'s 
                      <a class="externalDFN">application cache</a> as an
                      HTTP cache, and honor HTTP caching semantics (such as expiration, 
                      ETags, and so forth) with respect to that cache. User agents may also
                      have other caches in place that are also honored.
                      
                      <p class="note">
                        If the resource in question is already being <a title="fetch">fetched</a>
                        for other reasons, then the existing download process can
                        sometimes be used for the purposes of this step.
                      </p>
                    </li>
                    
                    <li>
                      If the previous step fails (e.g. the server returns a 4xx
                      or 5xx response or equivalent, or there is a DNS error, or
                      the connection times out, or the user cancels the download),
                      or if the server returned a redirect, then run the
                      <a href="#dfn-capture-failure-steps" class="internalDFN">capture failure steps</a> with the status code of the
                      previous step and terminate these steps.
                      <p class="note">
                        Redirects are fatal because they are either indicative of
                        a network problem (e.g. a captive portal); or would allow
                        resources to be added to the cache under URIs that differ
                        from any URI that the networking model will allow access
                        to, leaving orphan entries; or would allow resources to
                        be stored under URIs different than their true URIs. All
                        of these situations are bad.
                      </p>
                    </li>
                    
                    <li>
                      Otherwise, the <a class="externalDFN">fetching</a> succeeded.  
                      Store in <var>cache</var> a 
                      <a href="#dfn-managed" class="internalDFN">managed</a> resource comprising the resulting absolute URI,
                      its <a title="fetch">fetched</a> representation, and the list of 
                      <a href="#dfn-dynamic-methods" class="internalDFN">dynamic methods</a> passed to these steps. 
                    </li>
                    
                  </ol>
                </dd>
                <dt>
                  If <var>transaction</var> is marked as
                  <a title="off-line transaction" href="#dfn-off-line-transaction" class="internalDFN">off-line</a>.
                </dt>
                <dd>
                  <ol>
                    <li>
                      If the list of dynamic methods passed to these steps
                      includes the  method <code>GET</code>, then skip the
                      remaining sub-steps and store in <var>cache</var> a 
                      <a href="#dfn-managed" class="internalDFN">managed</a> resource comprising the resulting absolute 
                      URI and the list of 
                      <a href="#dfn-dynamic-methods" class="internalDFN">dynamic methods</a> passed to these steps. 
                    </li>
                    <li>
                      Let <var>representation</var> be the content passed
                      to these steps.
                    </li>
                    <li>
                      Let <var>type</var> be the content type passed to these steps.
                    </li>
                    <li>
                      If <var>type</var> is empty or null, set it to <code>text/plain</code>.
                    </li>
                    <li>
                      Store in <var>cache</var> a <a href="#dfn-managed" class="internalDFN">managed</a> resource comprising
                      the resulting absolute URI, <var>representation</var>, and the list of
                      <a href="#dfn-dynamic-methods" class="internalDFN">dynamic methods</a> passed to these
                      steps.                       
                    </li>
                  </ol>
                </dd>
              </dl></li>            
              <li>
                <a class="externalDFN">Queue a task</a> to fire an event at 
                <var>transaction</var> for the URI passed to these steps with the 
                name <a href="#event-captured"><code>captured</code></a>, which
                does not bubble, is not cancelable, and which uses the
                <a href="#idl-def-CacheEvent" class="idlType"><code>CacheEvent</code></a> interface.
              </li>
            </ol>
            
            <p>
              The <dfn id="dfn-capture-failure-steps">capture failure steps</dfn> are performed with a status
              code as follows:
            </p>
            
            <ol>
              <li>Discard <var>cache</var>.</li>
              <li>
                Set <var>cache group</var>'s <a href="#dfn-dynamic-update-status" class="internalDFN">dynamic update status</a>
                to <var>idle</var>.
              </li>
              <li>Pick the appropriate sub-steps:              
                <dl class="switch">
                  <dt>If the status code was not <code>404</code> or <code>410</code>  
                  <a class="externalDFN">or equivalent</a>, then</dt>
                  <dd>
                      Skip this resource and <a>release</a> it from 
                      <var>application cache</var>.
                  </dd>
                  <dt>Otherwise</dt>
                  <dd>
                    Set the error code to the status code passed to these steps.
                  </dd>
                </dl>
              </li>
              <li>
                Mark <var>transaction</var>'s <a href="#dfn-commit-status" class="internalDFN">commit status</a>
                as <var>aborted</var>.
              </li>
            </ol>
            
            <p>
              Attempts to <a>fetch</a> resources as part of the steps to 
              <a href="#dfn-add-a-resource-to-be-captured" class="internalDFN">add a resource to be captured</a>
              may be done with cache-defeating semantics, to avoid problems with
              stale or inconsistent intermediary caches.
            </p>
          </div>
          
          <div class="section" id="release-resource">
            <h4><span class="secno">4.2.3 </span>Releasing resources</h4>
            
            <p>
              When the user agent is required to 
              <dfn id="dfn-add-a-resource-to-be-released">add a resource to be <a href="#event-released" class="internalDFN">released</a></dfn>, given the URI of
              the resource to <a title="released" href="#event-released" class="internalDFN">release</a>, and a 
              <a href="#dfn-cache-transaction" class="internalDFN">cache transaction</a>, 
              the user agent must perform the following steps:
            </p>
            
            <ol>
              <li>
                Let <var>transaction</var> be the <a href="#dfn-cache-transaction" class="internalDFN">cache transaction</a>
                passed to these steps.
              </li>
              
              <li>
                If <var>transaction</var>'s <a href="#dfn-commit-status" class="internalDFN">commit status</a> is not
                <var>pending</var>, then set an error and abort these steps.
              </li>
              
              <li>
                Pick the appropriate sub-steps:
                <dl class="switch">
                  <dt>If the <a class="externalDFN">cache host</a> passed to
                  these steps is a <code>Document</code> object</dt> 
                  <dd>
                    Let <var>origin</var> be the <a href="#dfn-origin" class="internalDFN">origin</a> of the
                    <a class="externalDFN">cache host</a> passed to these steps.
                  </dd>
                  
                  <dt>If the <a class="externalDFN">cache host</a> passed to
                  these steps is a <code>WorkerGlobalScope</code> object</dt>
                  <dd>  
                    Let <var>origin</var> be the <a href="#dfn-origin" class="internalDFN">origin</a> of the scripts
                    in the worker for the <a class="externalDFN">cache host</a>
                    passed to these steps.
                  </dd>
                </dl>
              </li>
              
              <li>
                Resolve the URI passed to these steps relative to <var>base URI</var>. 
              </li>
              
              <li>
                If the resulting absolute URI has a different <code>&lt;scheme&gt;</code>
                component than the base URI (compared in an ASCII case-insensitive 
                manner), then set an error and abort these steps.
              </li>
              
              <li>
                If the resulting absolute URI does not have the same <a href="#dfn-origin" class="internalDFN">origin</a>
                as <var>base URI</var>, then set an error and abort these steps.
              </li>
              
              <li>
                Drop the <code>&lt;fragment&gt;</code> component of the resulting
                absolute URI, if it has one.
              </li>
              
              <li>
                Let <var>cache</var> be <var>transaction</var>'s 
                <a class="externalDFN">application cache</a>.
              </li>
              
              <li>
                If the resulting absolute URI does not identify a <a href="#dfn-managed" class="internalDFN">managed</a> 
                resource that is already in <var>cache</var>, then set an error
                and abort these steps.
              </li>
              
              <li>
                Remove the <a href="#dfn-managed" class="internalDFN">managed</a> 
                resource for the resulting absolute URI from <var>cache</var>.
              </li>
              
              <li>
                <a class="externalDFN">Queue a task</a> to fire an event at 
                <var>transaction</var> for the URI passed to these steps with the 
                name <a href="#event-released"><code>released</code></a>, which
                does not bubble, is not cancelable, and which uses the
                <a href="#idl-def-CacheEvent" class="idlType"><code>CacheEvent</code></a> interface.            
              </li>
            </ol>
          </div>
          
          <div class="section" id="complete-transaction"> 
            <h4><span class="secno">4.2.4 </span>Commiting a transaction</h4>
            
            <p>
              When the user agent is required to  
              <dfn id="dfn-commit-a-cache-transaction">commit a cache transaction</dfn>, given a <a href="#dfn-cache-transaction" class="internalDFN">cache transaction</a>, 
              it means that the user agent must run the following steps:
            </p>
            
            <ol>
              <li>
                Let <var>transaction</var> be the 
                <a href="#dfn-cache-transaction" class="internalDFN">cache transaction</a> passed to these steps.
              </li>

              <li>
                If <var>transaction</var>'s <a href="#dfn-commit-status" class="internalDFN">commit status</a> is not
                <var>pending</var>, then set an error and abort these steps.
              </li>
              
              <li>
                Let <var>cache</var> be <var>transaction</var>'s 
                <a class="externalDFN">application cache</a>.
              </li>
              
              <li>
                Let <var>cache group</var> be the 
                <a class="externalDFN">application cache group</a> containing 
                <var>cache</var>.
              </li>

              <li>
                Atomically, so as to avoid race conditions, perform the following
                sub-steps:
                <ol>
                  <li>
                    Let <var>cache group version</var> be the <a href="#dfn-version" class="internalDFN">version</a> of the 
                    <a class="externalDFN">relevant application cache</a> of 
                    <var>cache group</var>.
                  </li>
                  <li>
                    Set <var>cache</var>'s <a href="#dfn-version" class="internalDFN">version</a>
                    to be higher than <var>cache group version</var>.
                  </li>
                  <li>
                    Set the <var>cache</var>'s <a href="#dfn-dynamic-completeness-flag" class="internalDFN">dynamic completeness flag</a> to 
                    <var>complete</var>.
                  </li>                    
                  <li>Obtain the <a href="#dfn-storage-mutex" class="internalDFN">storage mutex</a>.</li>
                  <li>
                    If the host sets cookies in response to such a request, 
                    the user agent should update its cookie store accordingly. 
                  </li>
                  <li>Release the <a href="#dfn-storage-mutex" class="internalDFN">storage mutex</a>.</li>
                </ol>
              </li>
              <li>
                Pick the appropriate sub-steps:
                <dl class="switch">
                  <dt>
                    If <var>transaction</var> is marked as
                    <a title="off-line transaction" class="dfnref internalDFN" href="#dfn-off-line-transaction">off-line</a>, then
                  </dt>
                  <dd>
                    <ol>  
                      <li>
                        Make <var>cache</var> the 
                        <a class="externalDFN">effective application cache</a> for 
                        <var>cache group</var> to the 
                        <a class="externalDFN">cache host</a>
                        passed to these steps.
                      </li>
                    </ol>
                  </dd>
                  <dt>
                    If <var>transaction</var> is not marked as
                    <a title="off-line transaction" class="dfnref internalDFN" href="#dfn-off-line-transaction">off-line</a>, then
                  </dt>
                  <dd>
                    <ol>  
                      <li>
                        Set the <a href="#dfn-dynamic-update-status" class="internalDFN">dynamic update status</a> of <var>cache group</var> 
                        to <var>idle</var>.
                      </li>
                    </ol>
                  </dd>
                </dl>
              </li>
              <li>
                <a class="externalDFN">Queue a task</a> to fire an event at <var>transaction</var> 
                with the name <a href="#event-ready"><code>ready</code></a>,
                which does not bubble, is not cancelable, and which uses the
                <a href="#dfn-event" class="internalDFN"><code>Event</code></a> interface.                      
              </li>
              
              <li>
                Set <var>transaction</var>'s <a href="#dfn-commit-status" class="internalDFN">commit status</a> as <var>committed</var>.
              </li>              
            </ol>
          </div>           
          
          <div class="section" id="abort-transaction"> 
            <h4><span class="secno">4.2.5 </span>Aborting a transaction</h4>
            
            <p>
              When the user agent is required to <dfn id="dfn-abort-a-cache-transaction">abort a cache transaction</dfn>, 
              given a <a href="#dfn-cache-transaction" class="internalDFN">cache transaction</a>,
              it means that the user agent must run the following steps:
            </p>
            
            <ol>
              <li>
                Let <var>transaction</var> be the <a href="#dfn-cache-transaction" class="internalDFN">cache transaction</a>
                passed to these steps.
              </li>

              <li>
                If <var>transaction</var>'s <a href="#dfn-commit-status" class="internalDFN">commit status</a> is not
                <var>pending</var>, then set an error and abort these steps.
              </li>
              
              <li>
                Discard <var>transaction</var>'s <a class="externalDFN">application cache</a>.
              </li>
              
              <li>
                Set <var>transaction</var>'s <a href="#dfn-commit-status" class="internalDFN">commit status</a> as 
                <var>aborted</var>.
              </li>
            </ol>
          </div>
          
          <div class="section" id="datacache-api">
            <h4><span class="secno">4.2.6 </span>The API Entry Point</h4>
            <div class="example"><div class="exampleHeader">Example</div>  
              <p>
                Here's how a shared worker opens an 
                <a class="externalDFN">application cache group</a>. 
              </p>
              <div class="block"><div class="blockTitleDiv"><span class="blockTitle">ECMAScript</span></div><div class="blockContent"><pre class="code"><code class="es-code">var cache = self.applicationCache;</code></pre></div></div>
              <p>
                Here's how a window opens an 
                <a class="externalDFN">application cache group</a>.
              </p>
              <div class="block"><div class="blockTitleDiv"><span class="blockTitle">ECMAScript</span></div><div class="blockContent"><pre class="code"><code class="es-code">var cache = window.applicationCache;</code></pre></div></div>
            </div>
            <pre class="idl"><span class="idlInterface" id="idl-def-CacheUtil">[<span class="extAttr">Supplemental</span>]
interface <span class="idlInterfaceID">CacheUtil</span> {
<span class="idlAttribute">    attribute <span class="idlAttrType"><a href="#idl-def-ApplicationCache2Request" class="idlType"><code>ApplicationCache2Request</code></a></span> <span class="idlAttrName"><a href="#widl-CacheUtil-applicationCache">applicationCache</a></span>;</span>
};</span>
</pre><div class="section"><h5 id="attributes">Attributes</h5><dl class="attributes"><dt id="widl-CacheUtil-applicationCache"><code>applicationCache</code> of type <span class="idlAttrType"><a href="#idl-def-ApplicationCache2Request" class="idlType"><code>ApplicationCache2Request</code></a></span></dt><dd>
                <p>
                (In a window.) Returns the <a href="#idl-def-ApplicationCache2Request" class="idlType"><code>ApplicationCache2Request</code></a>  
                object that applies to the <a class="externalDFN">active document</a>
                of that <a class="externalDFN"><code>Window</code></a>.
                </p>
                <p>
                (In a shared worker.) Returns the <a href="#idl-def-ApplicationCache2Request" class="idlType"><code>ApplicationCache2Request</code></a>  
                object that applies to the current shared worker.                 
                </p>
              <div><em>No exceptions.</em></div></dd></dl></div>
  
            <pre class="idl"><span class="idlImplements"><a>Window</a> implements <a href="#idl-def-CacheUtil" class="idlType"><code>CacheUtil</code></a>;</span></pre><div class="idlImplementsDesc"><p>All instances of the <code><a>Window</a></code> type are defined to also implement the <a href="#idl-def-CacheUtil" class="idlType"><code>CacheUtil</code></a> interface.</p></div>
            <pre class="idl"><span class="idlImplements"><a>WorkerGlobalScope</a> implements <a href="#idl-def-CacheUtil" class="idlType"><code>CacheUtil</code></a>;</span></pre><div class="idlImplementsDesc"><p>All instances of the <code><a>WorkerGlobalScope</a></code> type are defined to also implement the <a href="#idl-def-CacheUtil" class="idlType"><code>CacheUtil</code></a> interface.</p></div>
  
            <!--dl class="idl" title="[Supplemental] interface CacheUtilSync">
               <dt>attribute ApplicationCache2Re applicationCache</dt>
              <dd>
                (In a shared worker.) Returns the <a><code>ApplicationCache2Sync</code></a>  
                object that applies to the current shared worker. 
              </dd>
            </dl-->
          </div>
        
          <div id="request-events" class="section">
            <h4><span class="secno">4.2.7 </span>Asynchronous requests</h4>
            <p>
              Events are fired during asynchronous access as <a href="#dfn-managed" class="internalDFN">managed</a> 
              resources are accessed and manipulated. As requests are made for 
              <a href="#dfn-managed" class="internalDFN">managed</a> resources, the user agent processes them and saves
              or retrieves data from the network or storage, and when the 
              required data is available, it alerts the application through the
              firing of events. The events are as follows:
            </p>
            <table style="margin-bottom: 0.5em;">
              <thead><tr><th>Event name</th><th>Dispatched when...</th></tr></thead>
              <tbody>
                <tr>
                  <td><dfn id="event-success"><code>success</code></dfn></td>
                  <td>The <a class="externalDFN">application cache</a> request has 
                  been completed and its results are available.</td>
                </tr>
                <tr>
                  <td><dfn id="event-error"><code>error</code></dfn></td>
                  <td>There was an error performing the 
                  <a class="externalDFN">application cache</a> request.</td>
                </tr>
              </tbody>
            </table>
            
            <pre class="idl"><span class="idlInterface" id="idl-def-AppCacheRequest">interface <span class="idlInterfaceID">AppCacheRequest</span> {
<span class="idlMethod">    <span class="idlMethType"><a>void</a></span> <span class="idlMethName"><a href="#widl-AppCacheRequest-abort">abort</a></span> ();</span>
<span class="idlConst">    const <span class="idlConstType"><a>unsigned short</a></span> <span class="idlConstName"><a href="#widl-AppCacheRequest-INITIAL">INITIAL</a></span> = <span class="idlConstValue">0</span>;</span>
<span class="idlConst">    const <span class="idlConstType"><a>unsigned short</a></span> <span class="idlConstName"><a href="#widl-AppCacheRequest-LOADING">LOADING</a></span> = <span class="idlConstValue">1</span>;</span>
<span class="idlConst">    const <span class="idlConstType"><a>unsigned short</a></span> <span class="idlConstName"><a href="#widl-AppCacheRequest-DONE">DONE</a></span> = <span class="idlConstValue">2</span>;</span>
<span class="idlAttribute">    readonly attribute <span class="idlAttrType"><a>unsigned short</a></span> <span class="idlAttrName"><a href="#widl-AppCacheRequest-readyState">readyState</a></span>;</span>
<span class="idlAttribute">    readonly attribute <span class="idlAttrType"><a>any</a></span>            <span class="idlAttrName"><a href="#widl-AppCacheRequest-error">error</a></span>;</span>
<span class="idlAttribute">    readonly attribute <span class="idlAttrType"><a>any</a></span>            <span class="idlAttrName"><a href="#widl-AppCacheRequest-result">result</a></span>;</span>
<span class="idlAttribute">             attribute <span class="idlAttrType"><a>Function</a></span>       <span class="idlAttrName"><a href="#widl-AppCacheRequest-onsuccess">onsuccess</a></span>;</span>
<span class="idlAttribute">             attribute <span class="idlAttrType"><a>Function</a></span>       <span class="idlAttrName"><a href="#widl-AppCacheRequest-onerror">onerror</a></span>;</span>
};</span>
</pre><div class="section"><h5 id="attributes-1">Attributes</h5><dl class="attributes"><dt id="widl-AppCacheRequest-error"><code>error</code> of type <span class="idlAttrType"><a>any</a></span>, readonly</dt><dd>The error that occurred during the execution of this request<div><em>No exceptions.</em></div></dd><dt id="widl-AppCacheRequest-onerror"><code>onerror</code> of type <span class="idlAttrType"><a>Function</a></span></dt><dd>The <a class="externalDFN">event handler</a> for the 
              <a href="#event-error"><code>error</code></a> event<div><em>No exceptions.</em></div></dd><dt id="widl-AppCacheRequest-onsuccess"><code>onsuccess</code> of type <span class="idlAttrType"><a>Function</a></span></dt><dd>The <a class="externalDFN">event handler</a> for the 
              <a href="#event-success"><code>success</code></a> event<div><em>No exceptions.</em></div></dd><dt id="widl-AppCacheRequest-readyState"><code>readyState</code> of type <span class="idlAttrType"><a>unsigned short</a></span>, readonly</dt><dd>The completion state of this request<div><em>No exceptions.</em></div></dd><dt id="widl-AppCacheRequest-result"><code>result</code> of type <span class="idlAttrType"><a>any</a></span>, readonly</dt><dd>The result of a successful completion of the request<div><em>No exceptions.</em></div></dd></dl></div><div class="section"><h5 id="methods">Methods</h5><dl class="methods"><dt id="widl-AppCacheRequest-abort"><code>abort</code></dt><dd>Discontinue the in-flight request and return the 
              <a href="#widl-AppCacheRequest-readyState"><code>readyState</code></a> to
              <a href="#widl-AppCacheRequest-INITIAL"><code>INITIAL</code></a>. No 
              <a href="#widl-AppCacheRequest-result"><code>result</code></a> or 
              <a href="#widl-AppCacheRequest-error"><code>error</code></a> is
              set.<div><em>No parameters.</em></div><div><em>No exceptions.</em></div><div><em>Return type: </em><code><a>void</a></code></div></dd></dl></div><div class="section"><h5 id="constants">Constants</h5><dl class="constants"><dt id="widl-AppCacheRequest-DONE"><code>DONE</code> of type <span class="idlConstType"><a>unsigned short</a></span></dt><dd>This state indicates that a result to a previous request is
              available in the 
              <a href="#widl-AppCacheRequest-result"><code>result</code></a> or
              <a href="#widl-AppCacheRequest-error"><code>error</code></a>
              attribute.</dd><dt id="widl-AppCacheRequest-INITIAL"><code>INITIAL</code> of type <span class="idlConstType"><a>unsigned short</a></span></dt><dd>This state indicates that a request has not been started.</dd><dt id="widl-AppCacheRequest-LOADING"><code>LOADING</code> of type <span class="idlConstType"><a>unsigned short</a></span></dt><dd>This state indicates that a request has been started but its
              result is not yet available.</dd></dl></div>
          </div>
            
          <div class="section" id="extending-the-applicationcache-interface">
            <h4><span class="secno">4.2.8 </span>Extending the <code>ApplicationCache</code> interface</h4>
            <p>
              Additional metadata is available about an
              <a class="externalDFN">application cache</a> through the
              <a href="#idl-def-ApplicationCache2" class="idlType"><code>ApplicationCache2</code></a>.
            </p>
            <pre class="idl"><span class="idlInterface" id="idl-def-ApplicationCache2">interface <span class="idlInterfaceID">ApplicationCache2</span> : <span class="idlSuperclass"><a>ApplicationCache</a></span> {
<span class="idlAttribute">    readonly attribute <span class="idlAttrType"><a>unsigned long</a></span>      <span class="idlAttrName"><a href="#widl-ApplicationCache-version">version</a></span>;</span>
<span class="idlAttribute">    readonly attribute <span class="idlAttrType"><a>unsigned long long</a></span> <span class="idlAttrName"><a href="#widl-ApplicationCache-size">size</a></span>;</span>
<span class="idlAttribute">    readonly attribute <span class="idlAttrType"><a>long long</a></span>          <span class="idlAttrName"><a href="#widl-ApplicationCache-lastRefresh">lastRefresh</a></span>;</span>
<span class="idlAttribute">    readonly attribute <span class="idlAttrType"><a>unsigned long</a></span>      <span class="idlAttrName"><a href="#widl-ApplicationCache-pendingUpdates">pendingUpdates</a></span>;</span>
<span class="idlAttribute">    readonly attribute <span class="idlAttrType"><a>DOMString</a></span>          <span class="idlAttrName"><a href="#widl-ApplicationCache-outbox">outbox</a></span>;</span>
};</span>
</pre><div class="section"><h5 id="attributes-2">Attributes</h5><dl class="attributes"><dt id="widl-ApplicationCache-lastRefresh"><code>lastRefresh</code> of type <span class="idlAttrType"><a>long long</a></span>, readonly</dt><dd>The number of milliseconds since the midnight of January 1, 1970
              that elapsed till the time this 
              <a class="externalDFN">application cache</a> was last refreshed<div><em>No exceptions.</em></div></dd><dt id="widl-ApplicationCache-outbox"><code>outbox</code> of type <span class="idlAttrType"><a>DOMString</a></span>, readonly</dt><dd>The URL for processing items in the outbox of the application 
              using this <a class="externalDFN">application cache</a><div><em>No exceptions.</em></div></dd><dt id="widl-ApplicationCache-pendingUpdates"><code>pendingUpdates</code> of type <span class="idlAttrType"><a>unsigned long</a></span>, readonly</dt><dd>A count of the approximate number of updates that are pending for
              the application<div><em>No exceptions.</em></div></dd><dt id="widl-ApplicationCache-size"><code>size</code> of type <span class="idlAttrType"><a>unsigned long long</a></span>, readonly</dt><dd>The approximate number of bytes occupied by this 
              <a class="externalDFN">application cache</a>.<div><em>No exceptions.</em></div></dd><dt id="widl-ApplicationCache-version"><code>version</code> of type <span class="idlAttrType"><a>unsigned long</a></span>, readonly</dt><dd>The <a href="#dfn-version" class="internalDFN">version</a> of this <a class="externalDFN">application cache</a><div><em>No exceptions.</em></div></dd></dl></div>

            <div class="note">
              Interactions with an <a class="externalDFN">application cache</a>
              cause background network and storage processing. Since these
              actions can take time, an asynchronous request-based API is 
              specified here.
            </div>
            
            <pre class="idl"><span class="idlInterface" id="idl-def-ApplicationCache2Request">interface <span class="idlInterfaceID">ApplicationCache2Request</span> : <span class="idlSuperclass"><a href="#idl-def-ApplicationCache2" class="idlType"><code>ApplicationCache2</code></a></span> {
<span class="idlMethod">    <span class="idlMethType"><a href="#idl-def-AppCacheRequest" class="idlType"><code>AppCacheRequest</code></a></span>    <span class="idlMethName"><a href="#widl-ApplicationCacheRequest-setOutbox">setOutbox</a></span> (<span class="idlParam">in <span class="idlParamType"><a>DOMString</a></span> <span class="idlParamName">uri</span></span>);</span>
<span class="idlMethod">    <span class="idlMethType"><a href="#idl-def-AppCacheRequest" class="idlType"><code>AppCacheRequest</code></a></span>    <span class="idlMethName"><a href="#widl-ApplicationCacheRequest-immediate">immediate</a></span> (<span class="idlParam">in <span class="idlParamType"><a>DOMString</a></span> <span class="idlParamName">uri</span></span>, <span class="idlParam">in optional <span class="idlParamType"><a>DOMString</a></span> <span class="idlParamName">dynamicMethods</span></span>);</span>
<span class="idlMethod">    <span class="idlMethType"><a href="#idl-def-AppCacheRequest" class="idlType"><code>AppCacheRequest</code></a></span>    <span class="idlMethName"><a href="#widl-ApplicationCacheRequest-offline">offline</a></span> (<span class="idlParam">in <span class="idlParamType"><a>DOMString</a></span> <span class="idlParamName">uri</span></span>, <span class="idlParam">in <span class="idlParamType"><a>DOMString</a></span> <span class="idlParamName">body</span></span>, <span class="idlParam">in optional <span class="idlParamType"><a>DOMString</a></span> <span class="idlParamName">contentType</span></span>, <span class="idlParam">in optional <span class="idlParamType"><a>DOMString</a></span> <span class="idlParamName">dynamicMethods</span></span>);</span>
<span class="idlMethod">    <span class="idlMethType"><a href="#idl-def-AppCacheRequest" class="idlType"><code>AppCacheRequest</code></a></span>    <span class="idlMethName"><a href="#widl-ApplicationCacheRequest-transaction">transaction</a></span> (<span class="idlParam">in optional <span class="idlParamType"><a>boolean</a></span> <span class="idlParamName">restart</span></span>);</span>
<span class="idlMethod">    <span class="idlMethType"><a href="#idl-def-AppCacheRequest" class="idlType"><code>AppCacheRequest</code></a></span>    <span class="idlMethName"><a href="#widl-ApplicationCacheRequest-offlineTransaction">offlineTransaction</a></span> ();</span>
<span class="idlMethod">    <span class="idlMethType"><a href="#idl-def-CacheCursorRequest" class="idlType"><code>CacheCursorRequest</code></a></span> <span class="idlMethName"><a href="#widl-ApplicationCacheRequest-openModifiedItemCursor">openModifiedItemCursor</a></span> (<span class="idlParam">in <span class="idlParamType"><a>long</a></span> <span class="idlParamName">version</span></span>) raises (<span class="idlRaises"><a>DOMException</a></span>);</span>
};</span>
</pre><div class="section"><h5 id="methods-1">Methods</h5><dl class="methods"><dt id="widl-ApplicationCacheRequest-immediate"><code>immediate</code></dt><dd>
                When this method is called, the user agent returns immediately 
                with a new <a href="#idl-def-AppCacheRequest" class="idlType"><code>AppCacheRequest</code></a> object called 
                <var>result</var> and asynchronously performs the following steps:
                <ol>
                  <li>
                    Perform the steps to <a href="#dfn-create-a-cache-transaction" class="internalDFN">create a cache transaction</a>
                    using this <a class="externalDFN">application cache group</a> 
                    and an unset off-line flag. Call the returned
                    <a href="#dfn-cache-transaction" class="internalDFN">cache transaction</a> as <var>transaction</var>.
                  </li>
                  <li>
                    If there was an error while starting a <a href="#dfn-cache-transaction" class="internalDFN">cache transaction</a>, 
                    then perform the following sub-steps and skip the remaining steps:
                    <ol>
                      <li>
                        Set <var>result</var>'s 
                        <a href="#widl-AppCacheRequest-error"><code>error</code></a>
                        to be the error of the previous step.
                      </li>
                      <li>
                        <a class="externalDFN">Queue a task</a> to fire an event 
                        at <var>result</var> with the name 
                        <a class="#event-error internalDFN" href="#event-error"><code>error</code></a>, which
                        does not bubble, is not cancelable, and which uses the
                        <a class="externalDFN"><code>Event</code></a> interface.
                      </li>
                    </ol>
                  </li>
                  <li>
                    Perform the steps to <a href="#dfn-add-a-resource-to-be-captured" class="internalDFN">add a resource to be captured</a>
                    with the URI passed to these steps, <var>transaction</var>,
                    and the dynamic methods passed to these steps.
                  </li>
                  <li>
                    If there was an error while capturing, then perform the
                    following sub-steps and skip the remaining steps:
                    <ol>
                      <li>
                        Set <var>result</var>'s 
                        <a href="#widl-AppCacheRequest-error"><code>error</code></a>
                        to be the error of the previous step.
                      </li>
                      <li>
                        <a class="externalDFN">Queue a task</a> to fire an event 
                        at <var>result</var> with the name 
                        <a class="#event-error internalDFN" href="#event-error"><code>error</code></a>, which
                        does not bubble, is not cancelable, and which uses the
                        <a class="externalDFN"><code>Event</code></a> interface.
                      </li>
                    </ol>
                  </li>
                  <li>
                    <a class="externalDFN">Queue a task</a> to fire an event 
                    at <var>result</var> with the name 
                    <a href="#event-success"><code>success</code></a>, which
                    does not bubble, is not cancelable, and which uses the
                    <a class="externalDFN"><code>Event</code></a> interface.                    
                  </li>
                  <li>
                    Switch to the <a class="externalDFN">newest application cache</a>
                    in this <a class="externalDFN">application cache group</a>.
                  </li>
                </ol>
                              
              <table class="parameters"><tr><th>Parameter</th><th>Type</th><th>Nullable</th><th>Optional</th><th>Description</th></tr><tr><td class="prmName">uri</td><td class="prmType"><code><a>DOMString</a></code></td><td class="prmNullFalse">✘</td><td class="prmOptFalse">✘</td><td class="prmDesc">identifying the resource to <a title="captured" href="#event-captured" class="internalDFN">capture</a></td></tr><tr><td class="prmName">dynamicMethods</td><td class="prmType"><code><a>DOMString</a></code></td><td class="prmNullFalse">✘</td><td class="prmOptTrue">✔</td><td class="prmDesc">
                    The <a href="#dfn-dynamic-methods" class="internalDFN">dynamic methods</a> that are applicable to the identified 
                    resource. This parameter is a comma separated list of protocol 
                    methods that can be intercepted for local processing. An empty 
                    string is allowed for this parameter.
                  </td></tr></table><div><em>No exceptions.</em></div><div><em>Return type: </em><code><a href="#idl-def-AppCacheRequest" class="idlType"><code>AppCacheRequest</code></a></code></div></dd><dt id="widl-ApplicationCacheRequest-offline"><code>offline</code></dt><dd> 
                When this method is called, the user agent returns immediately 
                with a new <a href="#idl-def-AppCacheRequest" class="idlType"><code>AppCacheRequest</code></a> object called 
                <var>result</var> and asynchronously performs the following steps:
                <ol>
                  <li>
                    Perform the steps to <a href="#dfn-create-a-cache-transaction" class="internalDFN">create a cache transaction</a>
                    using this <a class="externalDFN">application cache group</a> 
                    and a set off-line flag. Call the returned
                    <a href="#dfn-cache-transaction" class="internalDFN">cache transaction</a> as <var>transaction</var>.
                  </li>
                  <li>
                    If there was an error while starting a <a href="#dfn-cache-transaction" class="internalDFN">cache transaction</a>, 
                    then perform the following sub-steps and skip the remaining steps:
                    <ol>
                      <li>
                        Set <var>result</var>'s 
                        <a href="#widl-AppCacheRequest-error"><code>error</code></a>
                        to be the error of the previous step.
                      </li>
                      <li>
                        <a class="externalDFN">Queue a task</a> to fire an event 
                        at <var>result</var> with the name 
                        <a class="#event-error internalDFN" href="#event-error"><code>error</code></a>, which
                        does not bubble, is not cancelable, and which uses the
                        <a class="externalDFN"><code>Event</code></a> interface.
                      </li>
                    </ol>
                  </li>
                  <li>
                    Perform the steps to <a href="#dfn-add-a-resource-to-be-captured" class="internalDFN">add a resource to be captured</a>
                    with the URI passed to these steps, <var>transaction</var>,
                    the dynamic methods passed to these steps, the body
                    passed to these steps, and the content type passed to
                    these steps.
                  </li>
                  <li>
                    If there was an error while capturing, then perform the
                    following sub-steps and skip the remaining steps:
                    <ol>
                      <li>
                        Set <var>result</var>'s 
                        <a href="#widl-AppCacheRequest-error"><code>error</code></a>
                        to be the error of the previous step.
                      </li>
                      <li>
                        <a class="externalDFN">Queue a task</a> to fire an event 
                        at <var>result</var> with the name 
                        <a class="#event-error internalDFN" href="#event-error"><code>error</code></a>, which
                        does not bubble, is not cancelable, and which uses the
                        <a class="externalDFN"><code>Event</code></a> interface.
                      </li>
                    </ol>
                  </li>
                  <li>
                    <a class="externalDFN">Queue a task</a> to fire an event 
                    at <var>result</var> with the name 
                    <a href="#event-success"><code>success</code></a>, which
                    does not bubble, is not cancelable, and which uses the
                    <a class="externalDFN"><code>Event</code></a> interface.                    
                  </li>
                  <li>
                    Switch to the <a class="externalDFN">newest application cache</a>
                    in this <a class="externalDFN">application cache group</a>.
                  </li>
                </ol>
                
              <table class="parameters"><tr><th>Parameter</th><th>Type</th><th>Nullable</th><th>Optional</th><th>Description</th></tr><tr><td class="prmName">uri</td><td class="prmType"><code><a>DOMString</a></code></td><td class="prmNullFalse">✘</td><td class="prmOptFalse">✘</td><td class="prmDesc">identifying the resource to <a title="captured" href="#event-captured" class="internalDFN">capture</a></td></tr><tr><td class="prmName">body</td><td class="prmType"><code><a>DOMString</a></code></td><td class="prmNullFalse">✘</td><td class="prmOptFalse">✘</td><td class="prmDesc">entity body for the resource</td></tr><tr><td class="prmName">contentType</td><td class="prmType"><code><a>DOMString</a></code></td><td class="prmNullFalse">✘</td><td class="prmOptTrue">✔</td><td class="prmDesc">The MIME type of the entity body</td></tr><tr><td class="prmName">dynamicMethods</td><td class="prmType"><code><a>DOMString</a></code></td><td class="prmNullFalse">✘</td><td class="prmOptTrue">✔</td><td class="prmDesc">
                    The <a href="#dfn-dynamic-methods" class="internalDFN">dynamic methods</a> that are applicable to the identified 
                    resource. This parameter is a comma separated list of protocol 
                    methods that can be intercepted for local processing. An empty 
                    string is allowed for this parameter.
                  </td></tr></table><div><em>No exceptions.</em></div><div><em>Return type: </em><code><a href="#idl-def-AppCacheRequest" class="idlType"><code>AppCacheRequest</code></a></code></div></dd><dt id="widl-ApplicationCacheRequest-offlineTransaction"><code>offlineTransaction</code></dt><dd>
                When this method is called, the user agent returns immediately 
                with a new <a href="#idl-def-AppCacheRequest" class="idlType"><code>AppCacheRequest</code></a> object called 
                <var>result</var> and asynchronously performs the following steps:
                <ol>
                  <li>
                    Perform the steps to <a href="#dfn-create-a-cache-transaction" class="internalDFN">create a cache transaction</a> with
                    this <a class="externalDFN">application cache group</a> of this 
                    object and a set off-line flag. 
                  </li>
                  <li>
                    If there was an error while starting a <a href="#dfn-cache-transaction" class="internalDFN">cache transaction</a>, 
                    then perform the following sub-steps and skip the remaining steps:
                    <ol>
                      <li>
                        Set <var>result</var>'s 
                        <a href="#widl-AppCacheRequest-error"><code>error</code></a>
                        to be the error of the previous step.
                      </li>
                      <li>
                        <a class="externalDFN">Queue a task</a> to fire an event 
                        at <var>result</var> with the name 
                        <a class="#event-error internalDFN" href="#event-error"><code>error</code></a>, which
                        does not bubble, is not cancelable, and which uses the
                        <a class="externalDFN"><code>Event</code></a> interface
                      </li>
                    </ol>
                  </li>
                  <li>
                    Call the returned <a href="#dfn-cache-transaction" class="internalDFN">cache transaction</a> as 
                    <var>transaction</var>.
                  </li>
                  <li>
                    Let <var>txn</var> be a new 
                    <a href="#idl-def-OfflineTransactionRequest" class="idlType"><code>OfflineTransactionRequest</code></a> object for
                    <var>transaction</var>.
                  </li>
                  <li>
                    Set <var>result</var>'s 
                    <a href="#widl-AppCacheRequest-result"><code>result</code></a>
                    to be <var>txn</var>.
                  </li>
                  <li>
                    <a class="externalDFN">Queue a task</a> to fire an event 
                    at <var>result</var> with the name 
                    <a class="#event-success internalDFN" href="#event-success"><code>success</code></a>, which
                    does not bubble, is not cancelable, and which uses the
                    <a class="externalDFN"><code>Event</code></a> interface.
                  </li>
                </ol>
              <div><em>No parameters.</em></div><div><em>No exceptions.</em></div><div><em>Return type: </em><code><a href="#idl-def-AppCacheRequest" class="idlType"><code>AppCacheRequest</code></a></code></div></dd><dt id="widl-ApplicationCacheRequest-openModifiedItemCursor"><code>openModifiedItemCursor</code></dt><dd>
                When this method is called, the user agent performs the
                steps to <a href="#dfn-create-a-cache-cursor" class="internalDFN">create a cache cursor</a> with 
                this <a class="externalDFN">application cache</a> and the
                version passed to these steps, and returns the
                result of those steps.
                
                
              <table class="parameters"><tr><th>Parameter</th><th>Type</th><th>Nullable</th><th>Optional</th><th>Description</th></tr><tr><td class="prmName">version</td><td class="prmType"><code><a>long</a></code></td><td class="prmNullFalse">✘</td><td class="prmOptFalse">✘</td><td class="prmDesc"><a title="version" href="#dfn-version" class="internalDFN">Version</a> of this 
                  <a href="#dfn-application-cache" class="internalDFN">application cache</a> since which modifications are sought.
                  A value <code>0</code> indicates that every modification since
                  the first <a href="#dfn-cache-transaction" class="internalDFN">cache transaction</a> of this 
                  <a href="#dfn-application-cache" class="internalDFN">application cache</a> is sought.</td></tr></table><table class="exceptions"><tr><th>Exception</th><th>Description</th></tr><tr><td class="excName"><a>DOMException</a></td><td class="excDesc">
                  The method must raise an 
                  <a class="externalDFN"><code>INVALID_STATE_ERR</code></a> if
                  the version passed to these steps is not less than the
                  <a href="#dfn-version" class="internalDFN">version</a> of this <a href="#dfn-application-cache" class="internalDFN">application cache</a>.
                </td></tr></table><div><em>Return type: </em><code><a href="#idl-def-CacheCursorRequest" class="idlType"><code>CacheCursorRequest</code></a></code></div></dd><dt id="widl-ApplicationCacheRequest-setOutbox"><code>setOutbox</code></dt><dd>
                Set the 
                              
              <table class="parameters"><tr><th>Parameter</th><th>Type</th><th>Nullable</th><th>Optional</th><th>Description</th></tr><tr><td class="prmName">uri</td><td class="prmType"><code><a>DOMString</a></code></td><td class="prmNullFalse">✘</td><td class="prmOptFalse">✘</td><td class="prmDesc">identifying the resource to use as the URL for processing items in
                  the outbox of the application using this 
                  <a class="externalDFN">application cache</a></td></tr></table><div><em>No exceptions.</em></div><div><em>Return type: </em><code><a href="#idl-def-AppCacheRequest" class="idlType"><code>AppCacheRequest</code></a></code></div></dd><dt id="widl-ApplicationCacheRequest-transaction"><code>transaction</code></dt><dd>
                When this method is called, the user agent returns immediately 
                with a new <a href="#idl-def-AppCacheRequest" class="idlType"><code>AppCacheRequest</code></a> object called 
                <var>result</var> and asynchronously performs the following steps:
                <ol>
                  <li>
                    If this <a class="externalDFN">application cache group</a>
                    has a <a href="#dfn-cache-transaction" class="internalDFN">cache transaction</a> whose <a href="#dfn-commit-status" class="internalDFN">commit status</a> 
                    is <var>pending</var>, then choose from the following:
                    <dl class="switch">
                      <dt>If the <var>restart</var> flag 
                        was passed to these steps and it is set</dt>
                      <dd>Let <var>transaction</var> be that 
                        <a href="#dfn-cache-transaction" class="internalDFN">cache transaction</a>.</dd>
                      <dt>Otherwise</dt>
                      <dd>Perform the steps to <a href="#dfn-abort-a-cache-transaction" class="internalDFN">abort a cache transaction</a>
                      with that <a href="#dfn-cache-transaction" class="internalDFN">cache transaction</a>.</dd>
                    </dl>
                  </li>
                  <li>
                    If <var>transaction</var> is not set, then perform the 
                    following sub-steps:
                    <ol>
                      <li>
                        Perform the steps to <a href="#dfn-create-a-cache-transaction" class="internalDFN">create a cache transaction</a> with
                        this <a class="externalDFN">application cache group</a> and 
                        an unset off-line flag. 
                      </li>
                      <li>
                        If there was an error while starting a <a href="#dfn-cache-transaction" class="internalDFN">cache transaction</a>, 
                        then perform the following sub-steps and skip the remaining steps:
                        <ol>
                          <li>
                            Set <var>result</var>'s 
                            <a href="#widl-AppCacheRequest-error"><code>error</code></a>
                            to be the error of the previous step.
                          </li>
                          <li>
                            <a class="externalDFN">Queue a task</a> to fire an event 
                            at <var>result</var> with the name 
                            <a class="#event-error internalDFN" href="#event-error"><code>error</code></a>, which
                            does not bubble, is not cancelable, and which uses the
                            <a class="externalDFN"><code>Event</code></a> interface.
                          </li>
                        </ol>
                      </li>
                      <li>
                        Call the returned <a href="#dfn-cache-transaction" class="internalDFN">cache transaction</a> as 
                        <var>transaction</var>.
                      </li>
                    </ol>
                  </li> 
                  <li>
                    Let <var>txn</var> be a new 
                    <a href="#idl-def-OnlineTransactionRequest" class="idlType"><code>OnlineTransactionRequest</code></a> object for
                    <var>transaction</var>.
                  </li>
                  <li>
                    Set <var>result</var>'s 
                    <a href="#widl-AppCacheRequest-result"><code>result</code></a>
                    to be <var>txn</var>.
                  </li>
                  <li>
                    <a class="externalDFN">Queue a task</a> to fire an event 
                    at <var>result</var> with the name 
                    <a class="#event-success internalDFN" href="#event-success"><code>success</code></a>, which
                    does not bubble, is not cancelable, and which uses the
                    <a class="externalDFN"><code>Event</code></a> interface.
                  </li>
                </ol>
                
              <table class="parameters"><tr><th>Parameter</th><th>Type</th><th>Nullable</th><th>Optional</th><th>Description</th></tr><tr><td class="prmName">restart</td><td class="prmType"><code><a>boolean</a></code></td><td class="prmNullFalse">✘</td><td class="prmOptTrue">✔</td><td class="prmDesc">This defaults to false. This flag specifies whether to continue a
                  previously abandoned <a href="#dfn-cache-transaction" class="internalDFN">cache transaction</a>.
                </td></tr></table><div><em>No exceptions.</em></div><div><em>Return type: </em><code><a href="#idl-def-AppCacheRequest" class="idlType"><code>AppCacheRequest</code></a></code></div></dd></dl></div> 
            
            <p>
              When the user agent is required to <dfn id="dfn-create-a-cache-cursor">create a cache cursor</dfn>,
              given the <a class="externalDFN">application cache</a> and the
              low watermark version, the user agent must return a new 
              <a href="#idl-def-CacheCursorRequest" class="idlType"><code>CacheCursorRequest</code></a> object, called <var>result</var>
              and asynchronously perform the following steps:
            </p>
            
            <ol>
              <li>
                Let <var>additions</var> be a list of entities with their URIs and 
                let <var>removals</var> be a list of URIs.
              </li>
              <li>
                Let <var>cache</var> be the <a class="externalDFN">application cache</a> 
                passed to these steps.
              </li>
              <li>
                For each <a class="externalDFN">application cache</a> belonging to 
                <var>cache</var>'s <a class="externalDFN">application cache group</a>, 
                starting from <var>cache</var>'s <a href="#dfn-version" class="internalDFN">version</a> down to 
                <var>low watermark version</var>, perform the following sub-steps:
                <ol>
                  <li>
                    Let <var>old cache</var> be the 
                    <a class="externalDFN">application cache</a>.
                  </li>
                  <li>
                    Let <var>old version</var> be <var>old cache</var>'s <a href="#dfn-version" class="internalDFN">version</a>.
                  </li>
                  <li>
                    For the entity <var>entity</var> of each <a href="#dfn-managed" class="internalDFN">managed</a> resource of 
                    <var>old cache</var> that was added in the <var>old version</var>, perform
                    the following steps:
                    <ol>
                      <li>
                        Let <var>id</var> be the URI of the <a href="#dfn-managed" class="internalDFN">managed</a> resource.
                      </li>
                      <li>
                        If neither <var>additions</var> nor <var>removals</var>
                        already includes <var>id</var>, then add <var>id</var>
                        with <var>entity</var> to <var>additions</var>.
                      </li>
                    </ol>
                  </li>
                  
                  <li>
                    For each <a href="#dfn-managed" class="internalDFN">managed</a> resource of <var>old cache</var> that was
                    removed in the <var>old version</var>, perform the following steps:
                    <ol>
                      <li>
                        Let <var>id</var> be the URI of the <a href="#dfn-managed" class="internalDFN">managed</a> resource.
                      </li>
                      <li>
                        If neither <var>additions</var> nor <var>removals</var>
                        already includes <var>id</var>, then add <var>id</var>
                        to <var>removals</var>.
                      </li>
                    </ol>
                  </li>   
                </ol>
              </li>
              <li>
                Prepare a list of items by appending <var>removals</var> to
                <var>additions</var> and set that list as <var>cursor</var>'s
                <var>item list</var>.
              </li>
              <li>
                Set <var>cursor</var>'s current position to the first item in
                <var>item list</var>.
              </li>
              <li>
                Set <var>result</var>'s 
                <a href="#widl-AppCacheRequest-result"><code>result</code></a> 
                to the item at <var>cursor</var>'s current position in
                <var>item list</var>.
              </li>
              <li>
                <a class="externalDFN">Queue a task</a> to fire an event 
                at <var>result</var> with the name 
                <a class="#event-success internalDFN" href="#event-success"><code>success</code></a>, which
                does not bubble, is not cancelable, and which uses the
                <a class="externalDFN"><code>Event</code></a> interface.
              </li>
            </ol>
            
            <pre class="idl"><span class="idlInterface" id="idl-def-CacheCursorRequest">interface <span class="idlInterfaceID">CacheCursorRequest</span> : <span class="idlSuperclass"><a href="#idl-def-AppCacheRequest" class="idlType"><code>AppCacheRequest</code></a></span> {
<span class="idlMethod">    <span class="idlMethType"><a>void</a></span> <span class="idlMethName"><a href="#widl-CacheCursorRequest-continue">continue</a></span> ();</span>
};</span>
</pre><div class="section"><h5 id="methods-2">Methods</h5><dl class="methods"><dt id="widl-CacheCursorRequest-continue"><code>continue</code></dt><dd>
                <ol>
                  <li>
                    If there are no more items past this object's current position,
                    in <var>item list</var>, then skip the remaining steps and 
                    perform the following sub-steps:
                    <ol>
                      <li>
                        Set <a href="#widl-AppCacheRequest-error"><code>error</code></a>
                        to be <code>0</code>.
                      </li>
                      <li>
                        <a class="externalDFN">Queue a task</a> to fire an event 
                        at <var>result</var> with the name 
                        <a class="#event-error internalDFN" href="#event-error"><code>error</code></a>, which
                        does not bubble, is not cancelable, and which uses the
                        <a class="externalDFN"><code>Event</code></a> interface.
                      </li>
                    </ol>
                  </li>
                  <li>
                    If there is another item past this object's current position,
                    in <var>item list</var>, then move this object's current position
                    to the next in <var>item list</var>.
                  </li>
                  <li>
                    Set <a href="#widl-AppCacheRequest-result"><code>result</code></a> 
                    to the item at <var>cursor</var>'s current position in
                    <var>item list</var>.
                  </li>
                  <li>
                    <a class="externalDFN">Queue a task</a> to fire an event 
                    at this object with the name 
                    <a class="#event-success internalDFN" href="#event-success"><code>success</code></a>, which
                    does not bubble, is not cancelable, and which uses the
                    <a class="externalDFN"><code>Event</code></a> interface
                  </li>
                </ol>
              <div><em>No parameters.</em></div><div><em>No exceptions.</em></div><div><em>Return type: </em><code><a>void</a></code></div></dd></dl></div>
            
            <pre class="idl"><span class="idlInterface" id="idl-def-CacheTransactionRequest">interface <span class="idlInterfaceID">CacheTransactionRequest</span> {
<span class="idlAttribute">    attribute <span class="idlAttrType"><a>Function</a></span> <span class="idlAttrName"><a href="#widl-CacheTransactionRequest-oncaptured">oncaptured</a></span>;</span>
<span class="idlAttribute">    attribute <span class="idlAttrType"><a>Function</a></span> <span class="idlAttrName"><a href="#widl-CacheTransactionRequest-onreleased">onreleased</a></span>;</span>
<span class="idlAttribute">    attribute <span class="idlAttrType"><a>Function</a></span> <span class="idlAttrName"><a href="#widl-CacheTransactionRequest-onready">onready</a></span>;</span>
<span class="idlMethod">    <span class="idlMethType"><a>void</a></span>            <span class="idlMethName"><a href="#widl-CacheTransactionRequest-resetPendingUpdates">resetPendingUpdates</a></span> ();</span>
<span class="idlMethod">    <span class="idlMethType"><a>void</a></span>            <span class="idlMethName"><a href="#widl-CacheTransactionRequest-incrementPendingUpdates">incrementPendingUpdates</a></span> ();</span>
<span class="idlMethod">    <span class="idlMethType"><a>void</a></span>            <span class="idlMethName"><a href="#widl-CacheTransactionRequest-decrementPendingUpdates">decrementPendingUpdates</a></span> ();</span>
<span class="idlMethod">    <span class="idlMethType"><a href="#idl-def-AppCacheRequest" class="idlType"><code>AppCacheRequest</code></a></span> <span class="idlMethName"><a href="#widl-CacheTransactionRequest-getItem">getItem</a></span> (<span class="idlParam">in <span class="idlParamType"><a>DOMString</a></span> <span class="idlParamName">uri</span></span>);</span>
<span class="idlMethod">    <span class="idlMethType"><a href="#idl-def-AppCacheRequest" class="idlType"><code>AppCacheRequest</code></a></span> <span class="idlMethName"><a href="#widl-CacheTransactionRequest-release">release</a></span> (<span class="idlParam">in <span class="idlParamType"><a>DOMString</a></span> <span class="idlParamName">uri</span></span>);</span>
<span class="idlMethod">    <span class="idlMethType"><a href="#idl-def-AppCacheRequest" class="idlType"><code>AppCacheRequest</code></a></span> <span class="idlMethName"><a href="#widl-CacheTransactionRequest-abort">abort</a></span> ();</span>
<span class="idlMethod">    <span class="idlMethType"><a href="#idl-def-AppCacheRequest" class="idlType"><code>AppCacheRequest</code></a></span> <span class="idlMethName"><a href="#widl-CacheTransactionRequest-commit">commit</a></span> ();</span>
};</span>
</pre><div class="section"><h5 id="attributes-3">Attributes</h5><dl class="attributes"><dt id="widl-CacheTransactionRequest-oncaptured"><code>oncaptured</code> of type <span class="idlAttrType"><a>Function</a></span></dt><dd>The <a class="externalDFN">event handler</a> for the 
              <a href="#event-captured"><code>captured</code></a>
              event<div><em>No exceptions.</em></div></dd><dt id="widl-CacheTransactionRequest-onready"><code>onready</code> of type <span class="idlAttrType"><a>Function</a></span></dt><dd>The <a class="externalDFN">event handler</a> for the 
              <a href="#event-ready"><code>ready</code></a>
              event<div><em>No exceptions.</em></div></dd><dt id="widl-CacheTransactionRequest-onreleased"><code>onreleased</code> of type <span class="idlAttrType"><a>Function</a></span></dt><dd>The <a class="externalDFN">event handler</a> for the 
              <a href="#event-released"><code>released</code></a>
              event<div><em>No exceptions.</em></div></dd></dl></div><div class="section"><h5 id="methods-3">Methods</h5><dl class="methods"><dt id="widl-CacheTransactionRequest-abort"><code>abort</code></dt><dd>
                When called, this method must immediately return with a new 
                <a href="#idl-def-AppCacheRequest" class="idlType"><code>AppCacheRequest</code></a> object called <var>result</var> and
                asynchronously perform the following steps:
                <ol>
                  <li>
                    Execute the steps to <a href="#dfn-abort-a-cache-transaction" class="internalDFN">abort a cache transaction</a> with the 
                    this <a href="#dfn-cache-transaction" class="internalDFN">cache transaction</a>.
                  </li>
                  <li>
                    If the steps raised an error,
                    then skip the remaining steps and perform the following sub-steps:
                    <ol>
                      <li>
                        Set <a href="#widl-AppCacheRequest-error"><code>error</code></a>
                        to be the error set in the above steps.
                      </li>
                      <li>
                        <a class="externalDFN">Queue a task</a> to fire an event 
                        at <var>result</var> with the name 
                        <a class="#event-error internalDFN" href="#event-error"><code>error</code></a>, which
                        does not bubble, is not cancelable, and which uses the
                        <a class="externalDFN"><code>Event</code></a> interface.
                      </li>
                    </ol>
                  </li>
                  <li>
                    <a class="externalDFN">Queue a task</a> to fire an event 
                    at this object with the name 
                    <a class="#event-success internalDFN" href="#event-success"><code>success</code></a>, which
                    does not bubble, is not cancelable, and which uses the
                    <a class="externalDFN"><code>Event</code></a> interface.
                  </li>
                </ol>
              <div><em>No parameters.</em></div><div><em>No exceptions.</em></div><div><em>Return type: </em><code><a href="#idl-def-AppCacheRequest" class="idlType"><code>AppCacheRequest</code></a></code></div></dd><dt id="widl-CacheTransactionRequest-commit"><code>commit</code></dt><dd>
                When called, this method must immediately return with a new 
                <a href="#idl-def-AppCacheRequest" class="idlType"><code>AppCacheRequest</code></a> object called <var>result</var> and
                asynchronously perform the following steps:
                <ol>
                  <li>
                    Execute the steps to <a href="#dfn-commit-a-cache-transaction" class="internalDFN">commit a cache transaction</a> with the 
                    this <a href="#dfn-cache-transaction" class="internalDFN">cache transaction</a>.
                  </li>
                  <li>
                    If the steps raised an error,
                    then skip the remaining steps and perform the following sub-steps:
                    <ol>
                      <li>
                        Set <a href="#widl-AppCacheRequest-error"><code>error</code></a>
                        to be the error set in the above steps.
                      </li>
                      <li>
                        <a class="externalDFN">Queue a task</a> to fire an event 
                        at <var>result</var> with the name 
                        <a class="#event-error internalDFN" href="#event-error"><code>error</code></a>, which
                        does not bubble, is not cancelable, and which uses the
                        <a class="externalDFN"><code>Event</code></a> interface.
                      </li>
                    </ol>
                  </li>
                  <li>
                    <a class="externalDFN">Queue a task</a> to fire an event 
                    at this object with the name 
                    <a class="#event-success internalDFN" href="#event-success"><code>success</code></a>, which
                    does not bubble, is not cancelable, and which uses the
                    <a class="externalDFN"><code>Event</code></a> interface.
                  </li>
                </ol>
              <div><em>No parameters.</em></div><div><em>No exceptions.</em></div><div><em>Return type: </em><code><a href="#idl-def-AppCacheRequest" class="idlType"><code>AppCacheRequest</code></a></code></div></dd><dt id="widl-CacheTransactionRequest-decrementPendingUpdates"><code>decrementPendingUpdates</code></dt><dd>Decrement the count of pending updates for this  
                  <a class="externalDFN">application cache</a> by <code>1</code><div><em>No parameters.</em></div><div><em>No exceptions.</em></div><div><em>Return type: </em><code><a>void</a></code></div></dd><dt id="widl-CacheTransactionRequest-getItem"><code>getItem</code></dt><dd>
                When called, this method must immediately return with a new 
                <a href="#idl-def-AppCacheRequest" class="idlType"><code>AppCacheRequest</code></a> object called <var>result</var> and
                asynchronously perform the following steps:
                <ol>
                  <li>
                    If the resource identified by <var>uri</var> does not exist in this 
                    <a href="#dfn-cache-transaction" class="internalDFN">cache transaction</a>'s <a class="externalDFN">application cache</a>, 
                    then skip the remaining steps and perform the following sub-steps:
                    <ol>
                      <li>
                        Set <a href="#widl-AppCacheRequest-error"><code>error</code></a>
                        to be <a class="externalDFN"><code>NOT_FOUND_ERR</code></a>.
                      </li>
                      <li>
                        <a class="externalDFN">Queue a task</a> to fire an event 
                        at <var>result</var> with the name 
                        <a class="#event-error internalDFN" href="#event-error"><code>error</code></a>, which
                        does not bubble, is not cancelable, and which uses the
                        <a class="externalDFN"><code>Event</code></a> interface.
                      </li>
                    </ol>
                  </li>
                  <li>
                    Let <var>item</var> be the entity in this 
                    <a href="#dfn-cache-transaction" class="internalDFN">cache transaction</a>'s <a class="externalDFN">application cache</a>.
                  </li>
                  <li>
                    Create <var>object</var>, a new <a href="#idl-def-CacheItem" class="idlType"><code>CacheItem</code></a> 
                    object with the associated <var>item</var>.
                  </li>
                  <li>
                    Set <var>result</var>'s 
                    <a href="#widl-AppCacheRequest-result"><code>result</code></a> 
                    to <var>object</var>.
                  </li>
                  <li>
                    <a class="externalDFN">Queue a task</a> to fire an event 
                    at this object with the name 
                    <a class="#event-success internalDFN" href="#event-success"><code>success</code></a>, which
                    does not bubble, is not cancelable, and which uses the
                    <a class="externalDFN"><code>Event</code></a> interface.
                  </li>
                </ol>
                
              <table class="parameters"><tr><th>Parameter</th><th>Type</th><th>Nullable</th><th>Optional</th><th>Description</th></tr><tr><td class="prmName">uri</td><td class="prmType"><code><a>DOMString</a></code></td><td class="prmNullFalse">✘</td><td class="prmOptFalse">✘</td><td class="prmDesc">identifying the resource</td></tr></table><div><em>No exceptions.</em></div><div><em>Return type: </em><code><a href="#idl-def-AppCacheRequest" class="idlType"><code>AppCacheRequest</code></a></code></div></dd><dt id="widl-CacheTransactionRequest-incrementPendingUpdates"><code>incrementPendingUpdates</code></dt><dd>Increment the count of pending updates for this  
                  <a class="externalDFN">application cache</a> by <code>1</code><div><em>No parameters.</em></div><div><em>No exceptions.</em></div><div><em>Return type: </em><code><a>void</a></code></div></dd><dt id="widl-CacheTransactionRequest-release"><code>release</code></dt><dd>
                When called, this method must immediately return with a new 
                <a href="#idl-def-AppCacheRequest" class="idlType"><code>AppCacheRequest</code></a> object called <var>result</var> and
                asynchronously perform the following steps:
                <ol>
                  <li>
                    Perform the steps to <a href="#dfn-add-a-resource-to-be-released" class="internalDFN">add a resource to be released</a>
                    with the first argument being <var>uri</var> and 
                    the third being this <a href="#dfn-cache-transaction" class="internalDFN">cache transaction</a>.
                  </li>
                  <li>
                    If the steps raised an error,
                    then skip the remaining steps and perform the following sub-steps:
                    <ol>
                      <li>
                        Set <a href="#widl-AppCacheRequest-error"><code>error</code></a>
                        to be the error set in the above steps.
                      </li>
                      <li>
                        <a class="externalDFN">Queue a task</a> to fire an event 
                        at <var>result</var> with the name 
                        <a class="#event-error internalDFN" href="#event-error"><code>error</code></a>, which
                        does not bubble, is not cancelable, and which uses the
                        <a class="externalDFN"><code>Event</code></a> interface.
                      </li>
                    </ol>
                  </li>
                  <li>
                    <a class="externalDFN">Queue a task</a> to fire an event 
                    at this object with the name 
                    <a class="#event-success internalDFN" href="#event-success"><code>success</code></a>, which
                    does not bubble, is not cancelable, and which uses the
                    <a class="externalDFN"><code>Event</code></a> interface.
                  </li>
                </ol>
                
              <table class="parameters"><tr><th>Parameter</th><th>Type</th><th>Nullable</th><th>Optional</th><th>Description</th></tr><tr><td class="prmName">uri</td><td class="prmType"><code><a>DOMString</a></code></td><td class="prmNullFalse">✘</td><td class="prmOptFalse">✘</td><td class="prmDesc">identifying the resource to release</td></tr></table><div><em>No exceptions.</em></div><div><em>Return type: </em><code><a href="#idl-def-AppCacheRequest" class="idlType"><code>AppCacheRequest</code></a></code></div></dd><dt id="widl-CacheTransactionRequest-resetPendingUpdates"><code>resetPendingUpdates</code></dt><dd>Set the count of pending updates for this  
                  <a class="externalDFN">application cache</a> to <code>0</code><div><em>No parameters.</em></div><div><em>No exceptions.</em></div><div><em>Return type: </em><code><a>void</a></code></div></dd></dl></div>
            
            <pre class="idl"><span class="idlInterface" id="idl-def-OnlineTransactionRequest">interface <span class="idlInterfaceID">OnlineTransactionRequest</span> : <span class="idlSuperclass"><a href="#idl-def-CacheTransactionRequest" class="idlType"><code>CacheTransactionRequest</code></a></span> {
<span class="idlMethod">    <span class="idlMethType"><a href="#idl-def-AppCacheRequest" class="idlType"><code>AppCacheRequest</code></a></span> <span class="idlMethName"><a href="#widl-OnlineTransactionRequest-capture">capture</a></span> (<span class="idlParam">in <span class="idlParamType"><a>DOMString</a></span> <span class="idlParamName">uri</span></span>, <span class="idlParam">in optional <span class="idlParamType"><a>DOMString</a></span> <span class="idlParamName">dynamicMethods</span></span>);</span>
};</span>
</pre><div class="section"><h5 id="methods-4">Methods</h5><dl class="methods"><dt id="widl-OnlineTransactionRequest-capture"><code>capture</code></dt><dd>
                When called, this method must immediately return with a new 
                <a href="#idl-def-AppCacheRequest" class="idlType"><code>AppCacheRequest</code></a> object called <var>result</var> and
                asynchronously perform the following steps:
                <ol>
                  <li>
                    Perform the steps to <a href="#dfn-add-a-resource-to-be-captured" class="internalDFN">add a resource to be captured</a>
                    with the URI passed to these steps, this <a href="#dfn-cache-transaction" class="internalDFN">cache transaction</a>,
                    and the dynamic methods passed to these steps.
                  </li>
                  <li>
                    If there was an error while capturing, then perform the
                    following sub-steps and skip the remaining steps:
                    <ol>
                      <li>
                        Set <var>result</var>'s 
                        <a href="#widl-AppCacheRequest-error"><code>error</code></a>
                        to be the error of the previous step.
                      </li>
                      <li>
                        <a class="externalDFN">Queue a task</a> to fire an event 
                        at <var>result</var> with the name 
                        <a class="#event-error internalDFN" href="#event-error"><code>error</code></a>, which
                        does not bubble, is not cancelable, and which uses the
                        <a class="externalDFN"><code>Event</code></a> interface.
                      </li>
                    </ol>
                  </li>
                  <li>
                    <a class="externalDFN">Queue a task</a> to fire an event 
                    at <var>result</var> with the name 
                    <a class="#event-success internalDFN" href="#event-success"><code>success</code></a>, which
                    does not bubble, is not cancelable, and which uses the
                    <a class="externalDFN"><code>Event</code></a> interface.
                  </li>
                </ol>
                
              <table class="parameters"><tr><th>Parameter</th><th>Type</th><th>Nullable</th><th>Optional</th><th>Description</th></tr><tr><td class="prmName">uri</td><td class="prmType"><code><a>DOMString</a></code></td><td class="prmNullFalse">✘</td><td class="prmOptFalse">✘</td><td class="prmDesc">identifying the resource to <a>capture</a></td></tr><tr><td class="prmName">dynamicMethods</td><td class="prmType"><code><a>DOMString</a></code></td><td class="prmNullFalse">✘</td><td class="prmOptTrue">✔</td><td class="prmDesc">
                    The <a href="#dfn-dynamic-methods" class="internalDFN">dynamic methods</a> that are applicable to the identified 
                    resource. This parameter is a comma separated list of protocol 
                    methods that can be intercepted for local processing. An empty 
                    string is allowed for this parameter.
                  </td></tr></table><div><em>No exceptions.</em></div><div><em>Return type: </em><code><a href="#idl-def-AppCacheRequest" class="idlType"><code>AppCacheRequest</code></a></code></div></dd></dl></div>
            
            <pre class="idl"><span class="idlInterface" id="idl-def-OfflineTransactionRequest">interface <span class="idlInterfaceID">OfflineTransactionRequest</span> : <span class="idlSuperclass"><a href="#idl-def-CacheTransactionRequest" class="idlType"><code>CacheTransactionRequest</code></a></span> {
<span class="idlMethod">    <span class="idlMethType"><a href="#idl-def-AppCacheRequest" class="idlType"><code>AppCacheRequest</code></a></span> <span class="idlMethName"><a href="#widl-OfflineTransactionRequest-capture">capture</a></span> (<span class="idlParam">in <span class="idlParamType"><a>DOMString</a></span> <span class="idlParamName">uri</span></span>, <span class="idlParam">in <span class="idlParamType"><a>DOMString</a></span> <span class="idlParamName">body</span></span>, <span class="idlParam">in optional <span class="idlParamType"><a>DOMString</a></span> <span class="idlParamName">contentType</span></span>, <span class="idlParam">in optional <span class="idlParamType"><a>DOMString</a></span> <span class="idlParamName">dynamicMethods</span></span>);</span>
};</span>
</pre><div class="section"><h5 id="methods-5">Methods</h5><dl class="methods"><dt id="widl-OfflineTransactionRequest-capture"><code>capture</code></dt><dd>
                When called, this method must immediately return with a new 
                <a href="#idl-def-AppCacheRequest" class="idlType"><code>AppCacheRequest</code></a> object called <var>result</var> and
                asynchronously perform the following steps:
                <ol>
                  <li>
                    Perform the steps to <a href="#dfn-add-a-resource-to-be-captured" class="internalDFN">add a resource to be captured</a>
                    with the URI passed to these steps, <var>transaction</var>,
                    the dynamic methods passed to these steps, the body
                    passed to these steps, and the content type passed to
                    these steps.
                  </li>
                  <li>
                    If there was an error while capturing, then perform the
                    following sub-steps and skip the remaining steps:
                    <ol>
                      <li>
                        Set <var>result</var>'s 
                        <a href="#widl-AppCacheRequest-error"><code>error</code></a>
                        to be the error of the previous step.
                      </li>
                      <li>
                        <a class="externalDFN">Queue a task</a> to fire an event 
                        at <var>result</var> with the name 
                        <a class="#event-error internalDFN" href="#event-error"><code>error</code></a>, which
                        does not bubble, is not cancelable, and which uses the
                        <a class="externalDFN"><code>Event</code></a> interface.
                      </li>
                    </ol>
                  </li>
                  <li>
                    <a class="externalDFN">Queue a task</a> to fire an event 
                    at <var>result</var> with the name 
                    <a class="#event-success internalDFN" href="#event-success"><code>success</code></a>, which
                    does not bubble, is not cancelable, and which uses the
                    <a class="externalDFN"><code>Event</code></a> interface.
                  </li>
                </ol>
                
              <table class="parameters"><tr><th>Parameter</th><th>Type</th><th>Nullable</th><th>Optional</th><th>Description</th></tr><tr><td class="prmName">uri</td><td class="prmType"><code><a>DOMString</a></code></td><td class="prmNullFalse">✘</td><td class="prmOptFalse">✘</td><td class="prmDesc">identifying the resource to <a>capture</a></td></tr><tr><td class="prmName">body</td><td class="prmType"><code><a>DOMString</a></code></td><td class="prmNullFalse">✘</td><td class="prmOptFalse">✘</td><td class="prmDesc">entity body for the resource</td></tr><tr><td class="prmName">contentType</td><td class="prmType"><code><a>DOMString</a></code></td><td class="prmNullFalse">✘</td><td class="prmOptTrue">✔</td><td class="prmDesc">The MIME type of the entity body</td></tr><tr><td class="prmName">dynamicMethods</td><td class="prmType"><code><a>DOMString</a></code></td><td class="prmNullFalse">✘</td><td class="prmOptTrue">✔</td><td class="prmDesc">
                    The <a href="#dfn-dynamic-methods" class="internalDFN">dynamic methods</a> that are applicable to the identified 
                    resource. This parameter is a comma separated list of protocol 
                    methods that can be intercepted for local processing. An empty 
                    string is allowed for this parameter.
                  </td></tr></table><div><em>No exceptions.</em></div><div><em>Return type: </em><code><a href="#idl-def-AppCacheRequest" class="idlType"><code>AppCacheRequest</code></a></code></div></dd></dl></div>  <!--          
          </section>
          
          <section id="sync-datacache-interface" class="section">
            <h4>Synchronous Data Cache API</h4>
  
            <dl class="idl" title="interface CacheItemCursor">
              <dt>readonly attribute CacheItem item</dt>
              <dd></dd>
              <dt>bool continue()</dt>
              <dd></dd>
            </dl>

            <dl class="idl" title="interface ApplicationCache2Sync : interface ApplicationCache2">
              <dt>void immediate()</dt>
              <dd>
                When this method is called, the user agent creates a new 
                <a>cache transaction</a>, and performs the steps to 
                <a>add a resource to be captured</a> in that <a>cache transaction</a>, 
                and when the identified resource is <a title="capture">captured</a>,
                performs the steps to <a>activate updates</a> for this 
                <a class="externalDFN">application cache group</a>.
                <dl class="parameters">
                  <dt>DOMString uri</dt>
                  <dd>identifying the resource to <a>capture</a></dd>
                  <dt>optional DOMString dynamicMethods</dt>
                  <dd>
                    The <a>dynamic methods</a> that are applicable to the identified 
                    resource. This parameter is a comma separated list of protocol 
                    methods that can be intercepted for local processing. An empty 
                    string is allowed for this parameter.
                  </dd>
                </dl>              
              </dd>
              <dt>OnlineTransaction transaction()</dt>
              <dd>
                <p>
                This method must perform the following steps:
                </p>
                <ol>
                  <li>
                    Execute the steps to <a>create a cache transaction</a> with the
                    first argument being the 
                    <a class="externalDFN">application cache group</a> of this 
                    object and the second argument being false.
                  </li>
                  <li>
                    Let <var>result</var> be a new <a><code>CacheTransaction</code></a>
                    object for the <var>transaction</var> returned from the previous step.
                  </li>
                  <li>Return <var>result</var>.</li>
                </ol>
                <dl class="parameters">
                  <dt>optional boolean restart</dt>
                  <dd>This defaults to false. This flag specifies whether to continue a
                  previously abandoned <a>cache transaction</a>.</dt>
                </dl>
              </dd>
              <dt>OfflineTransaction offlineTransaction()</dt>
              <dd>
                This method takes one or two arguments - a <var>transaction 
                callback</var> and optionally an <var>error callback</var>.
                When called, this method must immediately return and asynchronously
                perform the following steps:
                <ol>
                  <li>
                    Execute the steps to <a>create a cache transaction</a> with the 
                    first argument being the  
                    <a class="externalDFN">application cache group</a> of this <a><code>DataCache</code></a> 
                    object and the second argument being <code>true</code>.
                  </li>
                  <li>
                    Let <var>result</var> be a new <a><code>CacheTransaction</code></a>
                    object for the <var>transaction</var> returned from the previous step.
                  </li>
                  <li>
                    If <var>transaction callback</var> is not null, 
                    <a class="externalDFN">queue a task</a> to invoke the 
                    <var>transaction callback</var>
                    with the aforementioned <a><code>CacheTransaction</code></a>
                    object as its only argument, and wait for that task to be run. 
                  </li>
                  <li>
                    If <var>transaction callback</var> raised an exception, jump to 
                    the last step. 
                  </li>
                  <li>
                    End these steps. The next step is only used when something goes wrong. 
                  </li>
                  <li>
                    <a class="externalDFN">Queue a task</a> to invoke the <var>error callback</var>, 
                    if it is not null. 
                  </li>
                </ol>
              </dd>
              <dt>void forEachModificationSince()</dt>
              <dd>
                 <dl class="parameters">
                  <dt>long version</dt>
                  <dd></dd>
                  <dt>ItemCallback callback</dt>
                  <dd></dd>
                </dl>
                This method takes one to three parameters - <var>low watermark version</var> and
                <var>item callback</var>, and an optional <var> success callback</var>. When
                called, this method must immediately return and asynchronously perform the
                following steps:
                <ol>
                  <li>
                    Let <var>additions</var> be a list of entities with their URIs and 
                    let <var>removals</var> be a list of URIs.
                  </li>
                  <li>
                    Let <var>cache</var> be the <a class="externalDFN">application cache</a>
                    represented by this object.
                  </li>
                  <li>
                    For each <a class="externalDFN">application cache</a> belonging to
                    <var>cache</var>'s <a class="externalDFN">application cache group</a>, 
                    starting from <var>cache</var>'s 
                    <a>version</a> down to <var>low watermark version</var>, 
                    perform the following sub-steps:
                    <ol>
                      <li>
                        Let <var>old cache</var> be the 
                        <a class="externalDFN">application cache</a>.
                      </li>
                      <li>
                        Let <var>old version</var> be <var>old cache</var>'s <a>version</a>.
                      </li>
                      <li>
                        For the entity <var>entity</var> of each <a>managed</a> resource of 
                        <var>old cache</var> that was added in the <var>old version</var>, perform
                        the following steps:
                        <ol>
                          <li>
                            Let <var>id</var> be the URI of the <a>managed</a> resource.
                          </li>
                          <li>
                            If neither <var>additions</var> nor <var>removals</var>
                            already includes <var>id</var>, then add <var>id</var>
                            with <var>entity</var> to <var>additions</var>.
                          </li>
                        </ol>
                      </li>
                      <li>
                        For each <a>managed</a> resource of <var>old cache</var> that was
                        removed in the <var>old version</var>, perform the following steps:
                        <ol>
                          <li>
                            Let <var>id</var> be the URI of the <a>managed</a> resource.
                          </li>
                          <li>
                            If neither <var>additions</var> nor <var>removals</var>
                            already includes <var>id</var>, then add <var>id</var>
                            to <var>removals</var>.
                          </li>
                        </ol>
                      </li>   
                    </ol>
                  </li>
                  <li>
                    If <var>item callback</var> is not null, then for each item 
                    <var>item</var> in <var>additions</var>, perform the following steps:
                    <ol>
                      <li>
                        For each item <var>item</var> in <var>additions</var>,
                        <a class="externalDFN">queue a task</a> to invoke the 
                        <var>item callback</var> with <var>item</var>.
                      </li>
                      <li>
                        For each item <var>item</var> in <var>removals</var>,
                        <a class="externalDFN">queue a task</a> to invoke the 
                        <var>item callback</var> with <var>item</var>.
                      </li>
                    </ol>
                  </li>
                  <li>
                    If <var>success callback</var> is not null, then 
                    <a class="externalDFN">queue a task</a> to invoke the <var>success callback</var>
                  </li>
                </ol>
              </dd>
            </dl>
          </section>
          
          <section id="transaction-interface" class="section">
            <h4>Transaction API</h4>
  
            <dl class="idl" title="interface CacheTransaction">
              <dt>void resetPendingUpdates()</dt>
              <dd></dd>
              <dt>void incrementPendingUpdates()</dt>
              <dd></dd>
              <dt>void decrementPendingUpdates()</dt>
              <dd></dd>
              <dt>CacheItem getItem(in DOMString uri)</dt>
              <dd>
                When called, this method must immediately return and
                asynchronously perform the following steps:
                <ol>
                  <li>
                    If the resource identified by <var>uri</var> does not exist in this 
                    <a><code>CacheTransaction</code></a> object's associated
                    <a class="externalDFN">application cache</a>, then the method must raise the 
                    <code>NOT_FOUND_ERR</code> exception and terminate these steps.
                  </li>
                  <li>
                    Let <var>item</var> be the entity in this 
                    <a><code>CacheTransaction</code></a> object's associated
                    <a class="externalDFN">application cache</a>.
                  </li>
                  <li>
                    Create <var>object</var>, a new <a><code>CacheItem</code></a> 
                    object with the associated <var>item</var>.
                  </li>
                  <li>
                    <a class="externalDFN">Queue a task</a> to invoke <var>item callback</var> with the
                    aforementioned <a><code>CacheItem</code></a> <var>object</var>
                    as its only argument.
                  </li>
                </ol>
                <dl class="parameters">
                  <dt>DOMString uri</dt>
                  <dd>identifying the resource</dd>
                  <dt>ItemCallback callback</dt>
                  <dd>Callback to invoke with the cached resource information</dd>
                </dl>
              </dd>
              <dt>void release(in DOMString uri)</dt>
              <dd>
                When called, this method must immediately return and asynchronously
                perform the steps to <a>add a resource to be released</a>
                with the first argument being <var>uri</var>, second being the
                <a class="externalDFN">active document</a> of the 
                <a class="externalDFN">browsing context</a> of the
                <code>Window</code> or <code>WorkerGlobalScope</code> object of the
                <code>Worker</code>,
                and the third being this <a><code>CacheTransaction</code></a> 
                object's associated <a>cache transaction</a>.
                <dl class="parameters">
                  <dt>DOMString uri</dt>
                  <dd>identifying the resource to release</dd>
                </dl>
              </dd>
              <dt>void commit()</dt>
              <dd>
                When called, this method must immediately return and asynchronously 
                perform the following steps:
                <ol>
                  <li>
                    Execute the steps to <a>commit a cache transaction</a> with the 
                    first argument being this <a><code>CacheTransaction</code></a>
                    object's associated <a>cache transaction</a>,              
                    and the second being the current <code>Window</code> or 
                    <code>Worker</code> object.
                  </li>
                  <li>
                    If <a href="#widl-CacheTransaction-oncommitted"><code>oncommitted</code></a>
                    attribute on this <a><code>CacheTransaction</code></a> object is not null, 
                    <a class="externalDFN">queue a task</a> to invoke the function identified by 
                    <a href="#widl-CacheTransaction-oncommitted"><code>oncommitted</code></a> .                    
                  </li>
                </ol>
              </dd>
            </dl>
            
            <dl class="idl" title="interface OnlineTransaction : CacheTransaction">
              <dt>void capture()</dt>
              <dd>
                When called, this
                method must immediately return and asynchronously perform the steps 
                to <a>add a resource to be captured</a> with the first argument being
                <var>uri</var>, second being the <a class="externalDFN">active document</a> 
                of the <a class="externalDFN">browsing context</a> of the
                <code>Window</code> or <code>WorkerGlobalScope</code> object of the
                <code>Worker</code>, the third being this 
                <a><code>CacheTransaction</code></a> object's associated 
                <a>cache transaction</a>,
                the fourth being <var>dynamic methods</var>.
                <dl class="parameters">
                  <dt>DOMString uri</dt>
                  <dd>identifying the resource to <a>capture</a></dd>
                  <dt>optional DOMString dynamicMethods</dt>
                  <dd>
                    The <a>dynamic methods</a> that are applicable to the identified 
                    resource. This parameter is a comma separated list of protocol 
                    methods that can be intercepted for local processing. An empty 
                    string is allowed for this parameter.
                  </dd>
                </dl>
              </dd>
              <dt>void abort()</dt>
              <dd>
                When called, this method must immediately return and asynchronously 
                perform the steps to <a>abort a cache transaction</a> with the first argument 
                being this <a><code>CacheTransaction</code></a> object's associated 
                <a>cache transaction</a>, and the second being the
                <code>window</code> or <code>worker</code> object.
              </dd>
            </dl>

            <dl class="idl" title="interface OfflineTransaction : CacheTransaction">
              <dt>void capture()</dt>
              <dd> When called, this
                method must immediately return and asynchronously perform the steps 
                to <a>add a resource to be captured</a> with the first argument being 
                <var>uri</var>, second being the 
                <a class="externalDFN">active document</a> of the
                <a class="externalDFN">browsing context</a> of the
                <code>window</code> or <code>WorkerGlobalScope</code> object of the
                <code>worker</code>,
                the third being this <a><code>CacheTransaction</code></a> object's 
                associated <a>cache transaction</a>, the fourth being 
                <var>dynamic methods</var>, the fifth being <var>entity body</var>, 
                and the sixth being <var>content type</var>.
                <dl class="parameters">
                  <dt>DOMString uri</dt>
                  <dd>identifying the resource to <a>capture</a></dd>
                  <dt>DOMString body</dt>
                  <dd>entity body for the resource</dd>
                  <dt>optional DOMString contentType</dt>
                  <dd>The MIME type of the entity body</dd>
                  <dt>optional DOMString dynamicMethods</dt>
                  <dd>
                    The <a>dynamic methods</a> that are applicable to the identified 
                    resource. This parameter is a comma separated list of protocol 
                    methods that can be intercepted for local processing. An empty 
                    string is allowed for this parameter.
                  </dd>
                </dl>
              </dd>
            </dl-->

            <pre class="idl"><span class="idlInterface" id="idl-def-CacheItem">interface <span class="idlInterfaceID">CacheItem</span> {
<span class="idlConst">    const <span class="idlConstType"><a>unsigned short</a></span> <span class="idlConstName"><a href="#widl-CacheItem-UNCACHED">UNCACHED</a></span> = <span class="idlConstValue">0</span>;</span>
<span class="idlConst">    const <span class="idlConstType"><a>unsigned short</a></span> <span class="idlConstName"><a href="#widl-CacheItem-FETCHING">FETCHING</a></span> = <span class="idlConstValue">1</span>;</span>
<span class="idlConst">    const <span class="idlConstType"><a>unsigned short</a></span> <span class="idlConstName"><a href="#widl-CacheItem-CACHED">CACHED</a></span> = <span class="idlConstValue">2</span>;</span>
<span class="idlConst">    const <span class="idlConstType"><a>unsigned short</a></span> <span class="idlConstName"><a href="#widl-CacheItem-GONE">GONE</a></span> = <span class="idlConstValue">3</span>;</span>
<span class="idlAttribute">    readonly attribute <span class="idlAttrType"><a>unsigned short</a></span> <span class="idlAttrName"><a href="#widl-CacheItem-readyState">readyState</a></span>;</span>
<span class="idlAttribute">    readonly attribute <span class="idlAttrType"><a>Blob</a></span>           <span class="idlAttrName"><a href="#widl-CacheItem-body">body</a></span>;</span>
<span class="idlAttribute">    readonly attribute <span class="idlAttrType"><a>DOMStringList</a></span>  <span class="idlAttrName"><a href="#widl-CacheItem-dynamicMethods">dynamicMethods</a></span>;</span>
<span class="idlAttribute">    readonly attribute <span class="idlAttrType"><a>any</a></span>            <span class="idlAttrName"><a href="#widl-CacheItem-headers">headers</a></span>;</span>
};</span>
</pre><div class="section"><h5 id="attributes-4">Attributes</h5><dl class="attributes"><dt id="widl-CacheItem-body"><code>body</code> of type <span class="idlAttrType"><a>Blob</a></span>, readonly</dt><dd>
                This attribute, on getting, must return the entity body, if any, as a 
                <a class="externalDFN"><code>Blob</code></a> object, of the <a href="#dfn-managed" class="internalDFN">managed</a> 
                resource associated with this <a href="#idl-def-CacheItem" class="idlType"><code>CacheItem</code></a> object.                 
              <div><em>No exceptions.</em></div></dd><dt id="widl-CacheItem-dynamicMethods"><code>dynamicMethods</code> of type <span class="idlAttrType"><a>DOMStringList</a></span>, readonly</dt><dd>
                This attribute, on getting, must return the list of protocol methods, 
                if any, of the <a href="#dfn-managed" class="internalDFN">managed</a> resource associated with this 
                <a href="#idl-def-CacheItem" class="idlType"><code>CacheItem</code></a> object.              
              <div><em>No exceptions.</em></div></dd><dt id="widl-CacheItem-headers"><code>headers</code> of type <span class="idlAttrType"><a>any</a></span>, readonly</dt><dd>
                This attribute, on getting, must return the headers as a native ordered
                dictionary data type from the <a href="#dfn-managed" class="internalDFN">managed</a> resource associated 
                with this <a href="#idl-def-CacheItem" class="idlType"><code>CacheItem</code></a> object. In the ECMAScript 
                binding, this must be <code>Object</code>. Each header must have
                one property (or dictionary
                entry), with those properties enumerating in the order that the headers
                were recorded in the <a href="#dfn-managed" class="internalDFN">managed</a> resource. Each property must
                have the name of the header and its value as recorded in the 
                <a href="#dfn-managed" class="internalDFN">managed</a> resource.
              <div><em>No exceptions.</em></div></dd><dt id="widl-CacheItem-readyState"><code>readyState</code> of type <span class="idlAttrType"><a>unsigned short</a></span>, readonly</dt><dd>
                This attribute, on getting, must return the current state of the 
                <a href="#dfn-managed" class="internalDFN">managed</a> resource.
              <div><em>No exceptions.</em></div></dd></dl></div><div class="section"><h5 id="constants-1">Constants</h5><dl class="constants"><dt id="widl-CacheItem-CACHED"><code>CACHED</code> of type <span class="idlConstType"><a>unsigned short</a></span></dt><dd>
                This <a href="#idl-def-CacheItem" class="idlType"><code>CacheItem</code></a> object is associated with a 
                <a href="#dfn-managed" class="internalDFN">managed</a> resource which has been cached.
              </dd><dt id="widl-CacheItem-FETCHING"><code>FETCHING</code> of type <span class="idlConstType"><a>unsigned short</a></span></dt><dd>
                This <a href="#idl-def-CacheItem" class="idlType"><code>CacheItem</code></a> object is associated with a 
                <a href="#dfn-managed" class="internalDFN">managed</a> resource which is currently being fetched.
                There is no value available in 
                <a href="#widl-CacheItem-body"><code>body</code></a>
                or <a href="#widl-CacheItem-headers"><code>headers</code></a>.
              </dd><dt id="widl-CacheItem-GONE"><code>GONE</code> of type <span class="idlConstType"><a>unsigned short</a></span></dt><dd>
                This <a href="#idl-def-CacheItem" class="idlType"><code>CacheItem</code></a> object is associated with a 
                <a href="#dfn-managed" class="internalDFN">managed</a> resource which has been released. There is no 
                value available in 
                <a href="#widl-CacheItem-body"><code>body</code></a>, 
                <a href="#widl-CacheItem-headers"><code>headers</code></a>, or 
                <a href="#widl-CacheItem-dynamicMethods"><code>dynamicMethods</code></a>.
              </dd><dt id="widl-CacheItem-UNCACHED"><code>UNCACHED</code> of type <span class="idlConstType"><a>unsigned short</a></span></dt><dd>
                This <a href="#idl-def-CacheItem" class="idlType"><code>CacheItem</code></a> object is associated with a 
                <a href="#dfn-managed" class="internalDFN">managed</a> resource
                which has been added for capturing but has not yet been cached. 
                There is no value available in <a href="#widl-CacheItem-body"><code>body</code></a>
                or <a href="#widl-CacheItem-headers"><code>headers</code></a>.
              </dd></dl></div>
          </div>          
          
          <div id="events-and-error" class="section">
            <h4><span class="secno">4.2.9 </span>The <code>CacheEvent</code> Interface</h4>
            <p>
              The <a class="externalDFN">task source</a> for this task is the
              <dfn id="dfn-networking-task-source">networking task source</dfn>.
            </p>
            
            <pre class="idl"><span class="idlInterface" id="idl-def-CacheEvent">interface <span class="idlInterfaceID">CacheEvent</span> : <span class="idlSuperclass"><a>Event</a></span> {
<span class="idlAttribute">    readonly attribute <span class="idlAttrType"><a>DOMString</a></span> <span class="idlAttrName"><a href="#widl-CacheEvent-uri">uri</a></span>;</span>
<span class="idlMethod">    <span class="idlMethType"><a>void</a></span> <span class="idlMethName"><a href="#widl-CacheEvent-initCacheEvent">initCacheEvent</a></span> (<span class="idlParam">in optional <span class="idlParamType"><a>DOMString</a></span> <span class="idlParamName">uri</span></span>);</span>
<span class="idlMethod">    <span class="idlMethType"><a>void</a></span> <span class="idlMethName"><a href="#widl-CacheEvent-initCacheEventNS">initCacheEventNS</a></span> (<span class="idlParam">in <span class="idlParamType"><a>DOMString</a></span> <span class="idlParamName">namespaceURI</span></span>, <span class="idlParam">in optional <span class="idlParamType"><a>DOMString</a></span> <span class="idlParamName">uri</span></span>);</span>
};</span>
</pre><div class="section"><h5 id="attributes-5">Attributes</h5><dl class="attributes"><dt id="widl-CacheEvent-uri"><code>uri</code> of type <span class="idlAttrType"><a>DOMString</a></span>, readonly</dt><dd>This attribute, on getting, must return the URI of the 
              <a href="#dfn-managed" class="internalDFN">managed</a> resource for which this event is fired.              
              <div><em>No exceptions.</em></div></dd></dl></div><div class="section"><h5 id="methods-6">Methods</h5><dl class="methods"><dt id="widl-CacheEvent-initCacheEvent"><code>initCacheEvent</code></dt><dd>These methods must initialize the event in a manner analogous to the
              similarly named methods in the DOM Events interfaces. 
              [<cite><a class="bibref" rel="biblioentry" href="#bib-DOM-LEVEL-3-EVENTS">DOM-LEVEL-3-EVENTS</a></cite>]
                
              <table class="parameters"><tr><th>Parameter</th><th>Type</th><th>Nullable</th><th>Optional</th><th>Description</th></tr><tr><td class="prmName">uri</td><td class="prmType"><code><a>DOMString</a></code></td><td class="prmNullFalse">✘</td><td class="prmOptTrue">✔</td><td class="prmDesc"></td></tr></table><div><em>No exceptions.</em></div><div><em>Return type: </em><code><a>void</a></code></div></dd><dt id="widl-CacheEvent-initCacheEventNS"><code>initCacheEventNS</code></dt><dd>These methods must initialize the event in a manner analogous to the
              similarly named methods in the DOM Events interfaces. 
              [<cite><a class="bibref" rel="biblioentry" href="#bib-DOM-LEVEL-3-EVENTS">DOM-LEVEL-3-EVENTS</a></cite>]
                
              <table class="parameters"><tr><th>Parameter</th><th>Type</th><th>Nullable</th><th>Optional</th><th>Description</th></tr><tr><td class="prmName">namespaceURI</td><td class="prmType"><code><a>DOMString</a></code></td><td class="prmNullFalse">✘</td><td class="prmOptFalse">✘</td><td class="prmDesc"></td></tr><tr><td class="prmName">uri</td><td class="prmType"><code><a>DOMString</a></code></td><td class="prmNullFalse">✘</td><td class="prmOptTrue">✔</td><td class="prmDesc"></td></tr></table><div><em>No exceptions.</em></div><div><em>Return type: </em><code><a>void</a></code></div></dd></dl></div>
            <p>
              The following are the <a href="#dfn-event-handler" class="internalDFN">event handler</a>s (and their corresponding 
              <a href="#dfn-event-handler-event-type" class="internalDFN">event handler event type</a>s) that must be supported, as IDL
              attributes, by objects implementing the 
              <a><code>CacheTransaction</code></a> interface and 
              <a href="#idl-def-CacheTransactionRequest" class="idlType"><code>CacheTransactionRequest</code></a> interface:
            </p>
            
            <table>
              <thead><tr>
                <th><a class="externalDFN">Event handler</a> </th>
                <th><a class="externalDFN">Event handler event type</a></th>
              </tr></thead>
              <tbody>
                <tr>
                  <td><dfn id="dfn-onready"><code>onready</code></dfn> </td>
                  <td><a href="#event-ready"><code>ready</code></a></td>
                </tr>
                <tr>
                  <td><dfn id="dfn-oncaptured"><code>oncaptured</code></dfn> </td>
                  <td><a href="#event-captured"><code>captured</code></a></td>
                </tr>
                <tr>
                  <td><dfn id="dfn-onreleased"><code>onreleased</code></dfn> </td>
                  <td><a href="#event-released"><code>released</code></a></td>
                </tr>
              </tbody>
            </table>        
            
          </div>
        </div>
  
        <div id="local-server" class="section">
          <h3><span class="secno">4.3 </span>Programmable HTTP Serving</h3>
          
          <p>
            An <a href="#dfn-embedded-local-server" class="internalDFN">embedded local server</a> is an application script that generates
            <a href="#dfn-dynamic" class="internalDFN">dynamic</a> responses to resource requests without making those
            requests to the origin server.
          </p>
          
          <p>
            An <dfn id="dfn-embedded-local-server">embedded local server</dfn> consists of an 
            <dfn id="dfn-interceptor">interceptor</dfn> function and zero or one <dfn id="dfn-reviewer">reviewer</dfn> function.
          </p>
          
          <p>
            An <a href="#dfn-embedded-local-server" class="internalDFN">embedded local server</a>
            serves requests to resources in its <dfn id="dfn-interception-namespace">interception namespace</dfn>.
          </p>
          
          <p>
            A <a class="externalDFN">cache host</a> can be associated with
            zero or more <a href="#dfn-embedded-local-server" class="internalDFN">embedded local server</a>s.
          </p>
          
          <p>
            An resource request issued in a <a class="externalDFN">cache host</a> can 
            be an <dfn id="dfn-interceptible-request">interceptible request</dfn> if the resource is in the 
            <a href="#dfn-interception-namespace" class="internalDFN">interception namespace</a> of an <a href="#dfn-embedded-local-server" class="internalDFN">embedded local server</a>
            registered in the <a class="externalDFN">browsing context</a> of the 
            <a class="externalDFN">cache host</a> and the resource is a 
            <a href="#dfn-dynamic-entry" class="internalDFN">dynamic entry</a> in the <a class="externalDFN">application cache group</a>
            associated with the <a class="externalDFN">cache host</a> and the request method 
            is identified as one of the <a href="#dfn-dynamic-entry" class="internalDFN">dynamic entry</a>'s <a href="#dfn-dynamic-methods" class="internalDFN">dynamic methods</a> . 
          </p>
          
          <p>
            If an <a href="#dfn-embedded-local-server" class="internalDFN">embedded local server</a>
            can <a>intercept a resource request</a>, then it is called a 
            <dfn id="dfn-candidate-local-server">candidate local server</dfn> for that request. 
          </p>
          
          <p>
            Multiple <a>embedded local servers</a> can be the <a href="#dfn-candidate-local-server" class="internalDFN">candidate local server</a>
            for a given resource request. If a user agent is to 
            <dfn id="dfn-select-an-embedded-local-server">select an embedded local server</dfn> from a list of
            <a href="#dfn-candidate-local-server" class="internalDFN">candidate local server</a>s that can produce a <a href="#dfn-dynamic" class="internalDFN">dynamic</a> representation
            of the requested resource, then the user agent must use the 
            <a href="#dfn-embedded-local-server" class="internalDFN">embedded local server</a> that has the most specific 
            <a href="#dfn-interception-namespace" class="internalDFN">interception namespace</a>.
          </p>
          <div id="request-interface" class="section">
            <h4><span class="secno">4.3.1 </span>Local Server Interfaces</h4>     
          
            <pre class="idl"><span class="idlInterface" id="idl-def-NavigatorLocalServer">[<span class="extAttr">Supplemental, NoInterfaceObject</span>]
interface <span class="idlInterfaceID">NavigatorLocalServer</span> {
<span class="idlMethod">    <span class="idlMethType"><a>void</a></span> <span class="idlMethName"><a href="#widl-NavigatorLocalServer-registerOfflineHandler">registerOfflineHandler</a></span> (<span class="idlParam">in <span class="idlParamType"><a>DOMString</a></span> <span class="idlParamName">namespace</span></span>, <span class="idlParam">in <span class="idlParamType"><a href="#idl-def-InterceptHandler" class="idlType"><code>InterceptHandler</code></a></span> <span class="idlParamName">intercept</span></span>, <span class="idlParam">in optional <span class="idlParamType"><a href="#idl-def-ReviewHandler" class="idlType"><code>ReviewHandler</code></a></span> <span class="idlParamName">review</span></span>);</span>
<span class="idlMethod">    <span class="idlMethType"><a>void</a></span> <span class="idlMethName"><a href="#widl-NavigatorLocalServer-removeOfflineHandler">removeOfflineHandler</a></span> (<span class="idlParam">in <span class="idlParamType"><a>DOMString</a></span> <span class="idlParamName">namespace</span></span>) raises (<span class="idlRaises"><a>DOMException</a></span>);</span>
};</span>
</pre><div class="section"><h5 id="methods-7">Methods</h5><dl class="methods"><dt id="widl-NavigatorLocalServer-registerOfflineHandler"><code>registerOfflineHandler</code></dt><dd>
                
                <p>
                  This method allows applications to register possible handlers 
                  for particular URI namespaces. Upon being invoked, this method 
                  should create a new <a href="#dfn-embedded-local-server" class="internalDFN">embedded local server</a> called 
                  <var>server</var> with its <a href="#dfn-interceptor" class="internalDFN">interceptor</a> 
                  function set to <var>intercept handler</var> and its 
                  <a href="#dfn-reviewer" class="internalDFN">reviewer</a> function set to <var>review handler</var> 
                  and add <var>server</var> to the <a href="#dfn-cache-host" class="internalDFN">cache host</a>, which is
                  the <a href="#dfn-active-document" class="internalDFN">active document</a> of the <a href="#dfn-browsing-context" class="internalDFN">browsing context</a> of the
                  <code>window</code> containing this <code>Navigator</code> object.
                  If a handler already exists for the given <var>namespace</var>,
                  the existing <a href="#dfn-embedded-local-server" class="internalDFN">embedded local server</a> is replaced with the
                  one created in this call.
                </p>                  
              <table class="parameters"><tr><th>Parameter</th><th>Type</th><th>Nullable</th><th>Optional</th><th>Description</th></tr><tr><td class="prmName">namespace</td><td class="prmType"><code><a>DOMString</a></code></td><td class="prmNullFalse">✘</td><td class="prmOptFalse">✘</td><td class="prmDesc">identifying the <a href="#dfn-interception-namespace" class="internalDFN">interception namespace</a> for this 
                  <a href="#dfn-embedded-local-server" class="internalDFN">embedded local server</a></td></tr><tr><td class="prmName">intercept</td><td class="prmType"><code><a href="#idl-def-InterceptHandler" class="idlType"><code>InterceptHandler</code></a></code></td><td class="prmNullFalse">✘</td><td class="prmOptFalse">✘</td><td class="prmDesc">the <a href="#dfn-interceptor" class="internalDFN">interceptor</a> function of this <a href="#dfn-embedded-local-server" class="internalDFN">embedded local server</a></td></tr><tr><td class="prmName">review</td><td class="prmType"><code><a href="#idl-def-ReviewHandler" class="idlType"><code>ReviewHandler</code></a></code></td><td class="prmNullFalse">✘</td><td class="prmOptTrue">✔</td><td class="prmDesc">the <a href="#dfn-reviewer" class="internalDFN">reviewer</a> function of this <a href="#dfn-embedded-local-server" class="internalDFN">embedded local server</a></td></tr></table><div><em>No exceptions.</em></div><div><em>Return type: </em><code><a>void</a></code></div></dd><dt id="widl-NavigatorLocalServer-removeOfflineHandler"><code>removeOfflineHandler</code></dt><dd>
                This method removes the registered <a href="#dfn-embedded-local-server" class="internalDFN">embedded local server</a>
                for the given namespace from the <a href="#dfn-cache-host" class="internalDFN">cache host</a>, which is
                the <a href="#dfn-active-document" class="internalDFN">active document</a> of the <a href="#dfn-browsing-context" class="internalDFN">browsing context</a> of the
                <code>window</code> containing this <code>Navigator</code> object.
                
                
              <table class="parameters"><tr><th>Parameter</th><th>Type</th><th>Nullable</th><th>Optional</th><th>Description</th></tr><tr><td class="prmName">namespace</td><td class="prmType"><code><a>DOMString</a></code></td><td class="prmNullFalse">✘</td><td class="prmOptFalse">✘</td><td class="prmDesc">identifying the <a href="#dfn-interception-namespace" class="internalDFN">interception namespace</a> for this 
                  <a href="#dfn-embedded-local-server" class="internalDFN">embedded local server</a></td></tr></table><table class="exceptions"><tr><th>Exception</th><th>Description</th></tr><tr><td class="excName"><a>DOMException</a></td><td class="excDesc">
                  The method must raise an 
                  <a class="externalDFN"><code>NOT_FOUND_ERR</code></a> if
                  the version passed to these steps is not less than the
                  <a href="#dfn-version" class="internalDFN">version</a> of this <a href="#dfn-application-cache" class="internalDFN">application cache</a>.                
                </td></tr></table><div><em>Return type: </em><code><a>void</a></code></div></dd></dl></div>

            <pre class="idl"><span class="idlImplements"><a>Navigator</a> implements <a href="#idl-def-NavigatorLocalServer" class="idlType"><code>NavigatorLocalServer</code></a>;</span></pre><div class="idlImplementsDesc"><p>All instances of the <code><a>Navigator</a></code> type are defined to also implement the <a href="#idl-def-NavigatorLocalServer" class="idlType"><code>NavigatorLocalServer</code></a> interface.</p></div>

            <pre class="idl"><span class="idlInterface" id="idl-def-InterceptHandler">[<span class="extAttr">Callback=FunctionOnly, NoInterfaceObject</span>]
interface <span class="idlInterfaceID">InterceptHandler</span> {
<span class="idlMethod">    <span class="idlMethType"><a>void</a></span> <span class="idlMethName"><a href="#widl-InterceptHandler-callback">callback</a></span> (<span class="idlParam">in <span class="idlParamType"><a href="#idl-def-HttpRequest" class="idlType"><code>HttpRequest</code></a></span> <span class="idlParamName">request</span></span>, <span class="idlParam">in <span class="idlParamType"><a href="#idl-def-MutableHttpResponse" class="idlType"><code>MutableHttpResponse</code></a></span> <span class="idlParamName">response</span></span>);</span>
};</span>
</pre><div class="section"><h5 id="methods-8">Methods</h5><dl class="methods"><dt id="widl-InterceptHandler-callback"><code>callback</code></dt><dd>
                <p>
                  The user agent must invoke the <a href="#idl-def-InterceptHandler" class="idlType"><code>InterceptHandler</code></a>,
                  with an <a href="#idl-def-HttpRequest" class="idlType"><code>HttpRequest</code></a>
                  object <var>request</var> based on the application's resource request and an 
                  <a href="#idl-def-MutableHttpResponse" class="idlType"><code>MutableHttpResponse</code></a>
                  object <var>response</var>. If the <a href="#widl-MutableHttpResponse-delay">
                  <code>delay()</code></a> method is invoked on <var>response</var>,
                  then when the <a href="#widl-MutableHttpResponse-send">
                  <code>send()</code></a> method is invoked on <var>response</var>, the
                  user agent <em class="rfc2119" title="must">must</em> respond to <var>request</var> with the headers, body, and
                  status specified in <var>response</var>.
                  If the <a href="#widl-MutableHttpResponse-delay">
                  <code>delay()</code></a> method is not invoked on <var>response</var>
                  in this callback, then the user agent <em class="rfc2119" title="must">must</em> respond to <var>request</var>
                  with the headers, body, and status, specified in <var>response</var>
                  when this function exits.
                </p>
                
              <table class="parameters"><tr><th>Parameter</th><th>Type</th><th>Nullable</th><th>Optional</th><th>Description</th></tr><tr><td class="prmName">request</td><td class="prmType"><code><a href="#idl-def-HttpRequest" class="idlType"><code>HttpRequest</code></a></code></td><td class="prmNullFalse">✘</td><td class="prmOptFalse">✘</td><td class="prmDesc"></td></tr><tr><td class="prmName">response</td><td class="prmType"><code><a href="#idl-def-MutableHttpResponse" class="idlType"><code>MutableHttpResponse</code></a></code></td><td class="prmNullFalse">✘</td><td class="prmOptFalse">✘</td><td class="prmDesc"></td></tr></table><div><em>No exceptions.</em></div><div><em>Return type: </em><code><a>void</a></code></div></dd></dl></div>

            <pre class="idl"><span class="idlInterface" id="idl-def-ReviewHandler">[<span class="extAttr">Callback=FunctionOnly, NoInterfaceObject</span>]
interface <span class="idlInterfaceID">ReviewHandler</span> {
<span class="idlMethod">    <span class="idlMethType"><a>void</a></span> <span class="idlMethName"><a href="#widl-ReviewHandler-callback">callback</a></span> (<span class="idlParam">in <span class="idlParamType"><a href="#idl-def-HttpRequest" class="idlType"><code>HttpRequest</code></a></span> <span class="idlParamName">request</span></span>, <span class="idlParam">in <span class="idlParamType"><a href="#idl-def-HttpResponse" class="idlType"><code>HttpResponse</code></a></span> <span class="idlParamName">response</span></span>);</span>
};</span>
</pre><div class="section"><h5 id="methods-9">Methods</h5><dl class="methods"><dt id="widl-ReviewHandler-callback"><code>callback</code></dt><dd>
                <p>
                  The user agent must invoke the <a href="#idl-def-ReviewHandler" class="idlType"><code>ReviewHandler</code></a>,
                  with an <a href="#idl-def-HttpRequest" class="idlType"><code>HttpRequest</code></a>
                  object <var>request</var> based on the application's resource request and an 
                  <a href="#idl-def-HttpResponse" class="idlType"><code>HttpResponse</code></a>
                  object <var>response</var> based on the host's response to that request. 
                </p>
                
              <table class="parameters"><tr><th>Parameter</th><th>Type</th><th>Nullable</th><th>Optional</th><th>Description</th></tr><tr><td class="prmName">request</td><td class="prmType"><code><a href="#idl-def-HttpRequest" class="idlType"><code>HttpRequest</code></a></code></td><td class="prmNullFalse">✘</td><td class="prmOptFalse">✘</td><td class="prmDesc"></td></tr><tr><td class="prmName">response</td><td class="prmType"><code><a href="#idl-def-HttpResponse" class="idlType"><code>HttpResponse</code></a></code></td><td class="prmNullFalse">✘</td><td class="prmOptFalse">✘</td><td class="prmDesc"></td></tr></table><div><em>No exceptions.</em></div><div><em>Return type: </em><code><a>void</a></code></div></dd></dl></div>

            <pre class="idl"><span class="idlInterface" id="idl-def-HttpRequest">interface <span class="idlInterfaceID">HttpRequest</span> {
<span class="idlAttribute">    readonly attribute <span class="idlAttrType"><a>DOMString</a></span> <span class="idlAttrName"><a href="#widl-HttpRequest-method">method</a></span>;</span>
<span class="idlAttribute">    readonly attribute <span class="idlAttrType"><a>DOMString</a></span> <span class="idlAttrName"><a href="#widl-HttpRequest-target">target</a></span>;</span>
<span class="idlAttribute">    readonly attribute <span class="idlAttrType"><a>DOMString</a></span> <span class="idlAttrName"><a href="#widl-HttpRequest-bodyText">bodyText</a></span>;</span>
<span class="idlAttribute">    readonly attribute <span class="idlAttrType"><a>any</a></span>       <span class="idlAttrName"><a href="#widl-HttpRequest-headers">headers</a></span>;</span>
};</span>
</pre><div class="section"><h5 id="attributes-6">Attributes</h5><dl class="attributes"><dt id="widl-HttpRequest-bodyText"><code>bodyText</code> of type <span class="idlAttrType"><a>DOMString</a></span>, readonly</dt><dd>
                This attribute is a DOMString representing the request entity body, 
                which on getting, must return the result of the following steps:
                <ol>
                  <li>
                    If the request entity body is null, return the empty string and 
                    terminate these steps.
                  </li>
                  <li>
                    Let <var>charset</var> be the value of the
                    <code>charset</code> parameter of the <code>Content-Type</code>
                    header or <code>null</code> if there was no <code>charset</code> 
                    parameter or if the header could not be parsed properly or was
                    omitted.
                  </li>
                  <li>
                    Let <var>mime</var> be the MIME type the <code>Content-Type</code> 
                    header contains without any parameters or <code>null</code> if 
                    the header could not be parsed properly or was omitted.
                  </li>
                  <li>
                    If <var>charset</var> is <code>null</code> and <var>mime</var> 
                    is <code>text/xml</code>, 
                    <code>application/xml</code>, or ends in <code>+xml</code> 
                    use the rules set forth in the XML specifications to determine
                    the character encoding. Let <var>charset</var> be the 
                    determined character encoding. 
                  </li>
                  <li>
                    If <var>charset</var> is <code>null</code> and <var>mime</var> is 
                    <code>application/json</code> follow the rules set forth in the 
                    [<cite><a class="bibref" rel="biblioentry" href="#bib-RFC4627">RFC4627</a></cite>] specification to determine the character encoding. 
                    Let <var>charset</var> be the determined character encoding. 
                  </li>
                  <li>
                    If <var>charset</var> is <code>null</code> and <var>mime</var> is 
                    <code>text/html</code> follow the rules set forth in the [<cite><a class="bibref" rel="biblioentry" href="#bib-HTML5">HTML5</a></cite>] 
                    specification to determine the character encoding. Let 
                    <var>charset</var> be the determined character encoding. 
                  </li>
                  <li>
                    If <var>charset</var> is <code>null</code>, then let 
                    <var>charset</var> be <code>UTF-8</code>. 
                  </li>
                  <li>
                    Return the result of decoding the response entity body using
                    <var>charset</var>. Replace bytes or sequences of bytes that are
                    not valid accordng to the <var>charset</var> with a single 
                    U+FFFD REPLACEMENT CHARACTER character.
                  </li>
                </ol>
              <div><em>No exceptions.</em></div></dd><dt id="widl-HttpRequest-headers"><code>headers</code> of type <span class="idlAttrType"><a>any</a></span>, readonly</dt><dd>
                This attribute, on getting, must return the headers as a native ordered
                dictionary data type from this <a href="#idl-def-HttpRequest" class="idlType"><code>HttpRequest</code></a> object. 
                In the JavaScript binding, this must be 
                <code>Object</code>. Each header must have one property (or dictionary
                entry), with those properties enumerating in the order that the headers
                were present in the request. Each property must have the name of the
                header and its value as present in the request.
              <div><em>No exceptions.</em></div></dd><dt id="widl-HttpRequest-method"><code>method</code> of type <span class="idlAttrType"><a>DOMString</a></span>, readonly</dt><dd>
                This attribute, on getting, must return the HTTP method, 
                in upper-case characters, present on this 
                <a href="#idl-def-HttpRequest" class="idlType"><code>HttpRequest</code></a> object.
              <div><em>No exceptions.</em></div></dd><dt id="widl-HttpRequest-target"><code>target</code> of type <span class="idlAttrType"><a>DOMString</a></span>, readonly</dt><dd>
                This attribute, on getting, must return the URI of this 
                <a href="#idl-def-HttpRequest" class="idlType"><code>HttpRequest</code></a> object.
              <div><em>No exceptions.</em></div></dd></dl></div>

            <pre class="idl"><span class="idlInterface" id="idl-def-MutableHttpResponse">interface <span class="idlInterfaceID">MutableHttpResponse</span> {
<span class="idlMethod">    <span class="idlMethType"><a>void</a></span> <span class="idlMethName"><a href="#widl-MutableHttpResponse-setStatus">setStatus</a></span> (<span class="idlParam">in <span class="idlParamType"><a>unsigned short</a></span> <span class="idlParamName">code</span></span>, <span class="idlParam">in <span class="idlParamType"><a>DOMString</a></span> <span class="idlParamName">message</span></span>);</span>
<span class="idlMethod">    <span class="idlMethType"><a>void</a></span> <span class="idlMethName"><a href="#widl-MutableHttpResponse-setResponseText">setResponseText</a></span> (<span class="idlParam">in <span class="idlParamType"><a>DOMString</a></span> <span class="idlParamName">text</span></span>);</span>
<span class="idlMethod">    <span class="idlMethType"><a>void</a></span> <span class="idlMethName"><a href="#widl-MutableHttpResponse-setResponseHeader">setResponseHeader</a></span> (<span class="idlParam">in <span class="idlParamType"><a>DOMString</a></span> <span class="idlParamName">name</span></span>, <span class="idlParam">in <span class="idlParamType"><a>DOMString</a></span> <span class="idlParamName">value</span></span>);</span>
<span class="idlMethod">    <span class="idlMethType"><a>void</a></span> <span class="idlMethName"><a href="#widl-MutableHttpResponse-delay">delay</a></span> ();</span>
<span class="idlMethod">    <span class="idlMethType"><a>void</a></span> <span class="idlMethName"><a href="#widl-MutableHttpResponse-send">send</a></span> ();</span>
};</span>
</pre><div class="section"><h5 id="methods-10">Methods</h5><dl class="methods"><dt id="widl-MutableHttpResponse-delay"><code>delay</code></dt><dd>
                Mark this response to be explicitly dispatched. This means that the
                <a href="#idl-def-InterceptHandler" class="idlType"><code>InterceptHandler</code></a> would need to explicitly call
                <a href="#widl-MutableHttpResponse-send"><code>send()</code></a>
                in order to mark the response as ready for being returned to the
                application.
              <div><em>No parameters.</em></div><div><em>No exceptions.</em></div><div><em>Return type: </em><code><a>void</a></code></div></dd><dt id="widl-MutableHttpResponse-send"><code>send</code></dt><dd>
                Upon calling, this method must dispatch this 
                <a href="#idl-def-MutableHttpResponse" class="idlType"><code>MutableHttpResponse</code></a>
                object. No further changes must be allowed to it. 
              <div><em>No parameters.</em></div><div><em>No exceptions.</em></div><div><em>Return type: </em><code><a>void</a></code></div></dd><dt id="widl-MutableHttpResponse-setResponseHeader"><code>setResponseHeader</code></dt><dd>
                This method takes two arguments - <var>name</var> and <var>value</var>  
                of a response header. Upon calling, this method must store the header
                with <var>name</var> and <var>value</var> in this 
                <a href="#idl-def-MutableHttpResponse" class="idlType"><code>MutableHttpResponse</code></a>
                object. If a value is already associated with this header, then
                this method must append <var>value</var> to it.
              <table class="parameters"><tr><th>Parameter</th><th>Type</th><th>Nullable</th><th>Optional</th><th>Description</th></tr><tr><td class="prmName">name</td><td class="prmType"><code><a>DOMString</a></code></td><td class="prmNullFalse">✘</td><td class="prmOptFalse">✘</td><td class="prmDesc"></td></tr><tr><td class="prmName">value</td><td class="prmType"><code><a>DOMString</a></code></td><td class="prmNullFalse">✘</td><td class="prmOptFalse">✘</td><td class="prmDesc"></td></tr></table><div><em>No exceptions.</em></div><div><em>Return type: </em><code><a>void</a></code></div></dd><dt id="widl-MutableHttpResponse-setResponseText"><code>setResponseText</code></dt><dd>
                This method takes a single arguments - <var>body</var> of the response entity.
                Upon calling, this method must store the entity <var>body</var> in this 
                <a href="#idl-def-MutableHttpResponse" class="idlType"><code>MutableHttpResponse</code></a>
                object, replacing any previous value.
              <table class="parameters"><tr><th>Parameter</th><th>Type</th><th>Nullable</th><th>Optional</th><th>Description</th></tr><tr><td class="prmName">text</td><td class="prmType"><code><a>DOMString</a></code></td><td class="prmNullFalse">✘</td><td class="prmOptFalse">✘</td><td class="prmDesc"></td></tr></table><div><em>No exceptions.</em></div><div><em>Return type: </em><code><a>void</a></code></div></dd><dt id="widl-MutableHttpResponse-setStatus"><code>setStatus</code></dt><dd>
                This method takes two arguments - <var>code</var> and <var>message</var>
                of the response status. Upon calling, this method must store the status
                with <var>code</var> and <var>message</var> in this 
                <a href="#idl-def-MutableHttpResponse" class="idlType"><code>MutableHttpResponse</code></a>
                object, replacing any previous values for both.
              <table class="parameters"><tr><th>Parameter</th><th>Type</th><th>Nullable</th><th>Optional</th><th>Description</th></tr><tr><td class="prmName">code</td><td class="prmType"><code><a>unsigned short</a></code></td><td class="prmNullFalse">✘</td><td class="prmOptFalse">✘</td><td class="prmDesc"></td></tr><tr><td class="prmName">message</td><td class="prmType"><code><a>DOMString</a></code></td><td class="prmNullFalse">✘</td><td class="prmOptFalse">✘</td><td class="prmDesc"></td></tr></table><div><em>No exceptions.</em></div><div><em>Return type: </em><code><a>void</a></code></div></dd></dl></div>

            <pre class="idl"><span class="idlInterface" id="idl-def-HttpResponse">interface <span class="idlInterfaceID">HttpResponse</span> {
<span class="idlAttribute">    readonly attribute <span class="idlAttrType"><a>unsigned short</a></span> <span class="idlAttrName"><a href="#widl-HttpResponse-statusCode">statusCode</a></span>;</span>
<span class="idlAttribute">    readonly attribute <span class="idlAttrType"><a>DOMString</a></span>      <span class="idlAttrName"><a href="#widl-HttpResponse-statusMessage">statusMessage</a></span>;</span>
<span class="idlAttribute">    readonly attribute <span class="idlAttrType"><a>DOMString</a></span>      <span class="idlAttrName"><a href="#widl-HttpResponse-bodyText">bodyText</a></span>;</span>
<span class="idlAttribute">    readonly attribute <span class="idlAttrType"><a>any</a></span>            <span class="idlAttrName"><a href="#widl-HttpResponse-headers">headers</a></span>;</span>
};</span>
</pre><div class="section"><h5 id="attributes-7">Attributes</h5><dl class="attributes"><dt id="widl-HttpResponse-bodyText"><code>bodyText</code> of type <span class="idlAttrType"><a>DOMString</a></span>, readonly</dt><dd>
                This attribute is a DOMString representing the response entity body, 
                which on getting, must return the result of the following steps:
                <ol>
                  <li>
                    If the response entity body is null, return the empty string and 
                    terminate these steps.
                  </li>
                  <li>
                    Let <var>charset</var> be the value of the
                    <code>charset</code> parameter of the <code>Content-Type</code>
                    header or <code>null</code> if there was no <code>charset</code> 
                    parameter or if the header could not be parsed properly or was
                    omitted.
                  </li>
                  <li>
                    Let <var>mime</var> be the MIME type the <code>Content-Type</code> 
                    header contains without any parameters or <code>null</code> if 
                    the header could not be parsed properly or was omitted.
                  </li>
                  <li>
                    If <var>charset</var> is <code>null</code> and <var>mime</var> 
                    is <code>text/xml</code>, 
                    <code>application/xml</code>, or ends in <code>+xml</code> 
                    use the rules set forth in the XML specifications to determine
                    the character encoding. Let <var>charset</var> be the 
                    determined character encoding. 
                  </li>
                  <li>
                    If <var>charset</var> is <code>null</code> and <var>mime</var> is 
                    <code>application/json</code> follow the rules set forth in the 
                    [<cite><a class="bibref" rel="biblioentry" href="#bib-RFC4627">RFC4627</a></cite>] specification to determine the character encoding. 
                    Let <var>charset</var> be the determined character encoding. 
                  </li>
                  <li>
                    If <var>charset</var> is <code>null</code> and <var>mime</var> is 
                    <code>text/html</code> follow the rules set forth in the [<cite><a class="bibref" rel="biblioentry" href="#bib-HTML5">HTML5</a></cite>] 
                    specification to determine the character encoding. Let 
                    <var>charset</var> be the determined character encoding. 
                  </li>
                  <li>
                    If <var>charset</var> is <code>null</code>, then let 
                    <var>charset</var> be <code>UTF-8</code>. 
                  </li>
                  <li>
                    Return the result of decoding the response entity body using
                    <var>charset</var>. Replace bytes or sequences of bytes that are
                    not valid accordng to the <var>charset</var> with a single 
                    U+FFFD REPLACEMENT CHARACTER character.
                  </li>
                </ol>
              <div><em>No exceptions.</em></div></dd><dt id="widl-HttpResponse-headers"><code>headers</code> of type <span class="idlAttrType"><a>any</a></span>, readonly</dt><dd>
                This attribute, on getting, must return the headers as a native ordered
                dictionary data type from this 
                <a href="#idl-def-HttpResponse" class="idlType"><code>HttpResponse</code></a> object. 
                In the JavaScript binding, this must be 
                <code>Object</code>. Each header must have one property (or dictionary
                entry), with those properties enumerating in the order that the headers
                were present in the response. Each property must have the name of the
                header and its value as present in the response.
              <div><em>No exceptions.</em></div></dd><dt id="widl-HttpResponse-statusCode"><code>statusCode</code> of type <span class="idlAttrType"><a>unsigned short</a></span>, readonly</dt><dd>
                This attribute, on getting, must return the status code of this 
                <a href="#idl-def-HttpResponse" class="idlType"><code>HttpResponse</code></a> object.
              <div><em>No exceptions.</em></div></dd><dt id="widl-HttpResponse-statusMessage"><code>statusMessage</code> of type <span class="idlAttrType"><a>DOMString</a></span>, readonly</dt><dd>
                This attribute, on getting, must return the status message of this 
                <a href="#idl-def-HttpResponse" class="idlType"><code>HttpResponse</code></a> object.
              <div><em>No exceptions.</em></div></dd></dl></div>
          </div>
      
          <div class="section" id="networking-model-changes">
            <h4><span class="secno">4.3.2 </span>Changes to the networking model</h4>
            
            <p>
              When a <a class="externalDFN">cache host</a> is associated with an
              <a class="externalDFN">application cache</a> whose 
              <a href="#dfn-dynamic-completeness-flag" class="internalDFN">dynamic completeness flag</a> is <var>complete</var>, any and all
              loads for resources related to that <a class="externalDFN">cache host</a>
              other than those for <a class="externalDFN">child browsing contexts</a>
              must go through the following steps prior to the 
              the networking model for application caches defined in [<cite><a class="bibref" rel="biblioentry" href="#bib-HTML5">HTML5</a></cite>].
            </p>

            <ol>
              <li>
                Let <var>request</var> be the resource request for 
                <a title="fetch">fetching</a> the resource.
              </li>
              <li>
                If <var>request</var> includes the HTTP header <code>Cache-Control</code>
                with the value <code>no-cache</code>, then <a>fetch</a> the resource
                normally, and abort these steps.
              </li>
              <li>
                Let <var>cache</var> be the <a class="externalDFN">application cache</a>
                for the <a class="externalDFN">cache host</a>.
              </li>
              <li>
                Let <var>resource</var> be the resource to be <a title="fetch">fetched</a>.
              </li>
              <li>
                If <var>resource</var> is not <a href="#dfn-managed" class="internalDFN">managed</a> in <var>cache</var>, then 
                <a class="externalDFN">fetch</a> a representation of <var>resource</var> 
                normally and abort these steps.
              </li>
              <li>
                If <var>request</var> is using the HTTP <code>GET</code> mechanism
                and <var>resource</var> is not defined in <var>cache</var> with a 
                <a title="dynamic methods" href="#dfn-dynamic-methods" class="internalDFN">dynamic <code>GET</code> method</a>, 
                then get the entity for <var>resource</var> from <var>cache</var>
                (instead of <a class="externalDFN">fetching</a> it), and abort these steps.
              </li>
              <li>
                If <var>request</var> is using the HTTP <code>HEAD</code> mechanism
                and <var>resource</var> is not defined in <var>cache</var> with a 
                <a title="dynamic methods" href="#dfn-dynamic-methods" class="internalDFN">dynamic <code>HEAD</code> method</a>,
                then get the entity headers for <var>resource</var> from <var>cache</var>
                (instead of <a class="externalDFN">fetching</a> it), and abort these steps.
              </li>
              <li>
                If <var>resource</var> is not defined in <var>cache</var> with the 
                <a title="dynamic methods" href="#dfn-dynamic-methods" class="internalDFN">dynamic method</a> that
                <var>request</var> is using, then <a class="externalDFN">fetch</a> a
                representation of <var>resource</var> normally and abort these steps.
              </li>
              <li>
                Perform the steps to <a href="#dfn-select-an-embedded-local-server" class="internalDFN">select an embedded local server</a> 
                <var>server</var>.
              </li>
              <li>
                If <var>server</var> is not set, then <a class="externalDFN">fetch</a>
                a representation of <var>resource</var> normally and abort these steps.
              </li>
              <li>
                Pick the appropriate steps:
                <dl class="switch">
                  <dt>If the user agent is off-line</dt>
                  <dd><ol>
                      <li>
                        Create a new response object to hold the <a href="#dfn-dynamic" class="internalDFN">dynamic</a> 
                        response to <var>request</var>.
                      </li>
                      <li>
                        Call the <a href="#dfn-interceptor" class="internalDFN">interceptor</a> function of <var>server</var>
                        passing as arguments <var>request</var> and <var>response</var>.
                      </li>
                      <li>
                        Wait for the <a href="#dfn-interceptor" class="internalDFN">interceptor</a> function to dispatch the 
                        <a href="#dfn-dynamic" class="internalDFN">dynamic</a> response until the typical network timeout.
                      </li>
                      <li>
                        If the <a href="#dfn-dynamic" class="internalDFN">dynamic</a> response times out, then raise a
                        time out error and abort these steps.
                      </li>
                      <li>
                        Handle <var>response</var> as the <a href="#dfn-dynamic" class="internalDFN">dynamic</a> response, 
                        and abort these steps.
                      </li>
                  </ol></dd>
                  <dt>If the user agent is online</dt>
                  <dd><ol>
                      <li>
                        If the <a href="#dfn-reviewer" class="internalDFN">reviewer</a> function of <var>server</var>
                        is not set, then abort these steps and perform the steps
                        for the case when the user agent is off-line.
                      </li>
                      <li>
                        <a class="externalDFN">Fetch</a> a representation of 
                        <var>resource</var> normally and call it <var>response</var>. 
                      </li>
                      <li>
                        Call the <a href="#dfn-reviewer" class="internalDFN">reviewer</a> function of <var>server</var> passing as
                        arguments <var>request</var> and <var>response</var>.
                      </li>
                      <li>
                        Handle <var>response</var> as the <a href="#dfn-dynamic" class="internalDFN">dynamic</a> response, and abort
                        these steps.
                      </li>
                  </ol></dd>
                </dl>
              </li>
            </ol>
          </div>
        </div>
      </div>
      <div id="security" class="section">
        <!--OddPage--><h2><span class="secno">5. </span>Security Considerations</h2>
        <div class="ednote">
          This section is not complete.
        </div>
        <p>
          Apart from requirements affecting security made throughout
          this specification implementations may, at their discretion,
          not expose certain headers, such as HttpOnly cookies. 
        </p>
      </div>
    
      
    <div class="section appendix" id="acknowledgements">
      <!--OddPage--><h2><span class="secno">A. </span>Acknowledgements</h2>
      <div>
        The editor of this specification was employed by Oracle Corp during its early 
        drafts.
      </div>
      <div>
        Thanks to Garret Swart, Colm Divilly, Ashish Motivala, Joseph Pecoraro, and Mike Wilson 
        for their useful comments that have led to improvements to this specification over time.
      </div>
    </div>
  
<div id="references" class="appendix section"><!--OddPage--><h2><span class="secno">B. </span>References</h2><div id="normative-references" class="section"><h3><span class="secno">B.1 </span>Normative references</h3><dl class="bibliography"><dt id="bib-COOKIES">[COOKIES]</dt><dd>Adam Barth. <cite><a href="http://tools.ietf.org/html/draft-abarth-cookie">HTTP State Management Mechanism</a>.</cite> IETF, November 2009
</dd><dt id="bib-DOM-LEVEL-3-CORE">[DOM-LEVEL-3-CORE]</dt><dd>Gavin Nicol; et al. <a href="http://www.w3.org/TR/2004/REC-DOM-Level-3-Core-20040407"><cite>Document Object Model (DOM) Level 3 Core Specification.</cite></a> 7 April 2004. W3C Recommendation. URL: <a href="http://www.w3.org/TR/2004/REC-DOM-Level-3-Core-20040407">http://www.w3.org/TR/2004/REC-DOM-Level-3-Core-20040407</a> 
</dd><dt id="bib-DOM-LEVEL-3-EVENTS">[DOM-LEVEL-3-EVENTS]</dt><dd>Björn Höhrmann; Tom Pixley; Philippe Le Hégaret. <a href="http://www.w3.org/TR/2007/WD-DOM-Level-3-Events-20071221"><cite>Document Object Model (DOM) Level 3 Events Specification.</cite></a> 21 December 2007. W3C Working Draft. (Work in progress.) URL: <a href="http://www.w3.org/TR/2007/WD-DOM-Level-3-Events-20071221">http://www.w3.org/TR/2007/WD-DOM-Level-3-Events-20071221</a> 
</dd><dt id="bib-FILE-API">[FILE-API]</dt><dd>Arun Ranganathan. <a href="http://www.w3.org/TR/2009/WD-FileAPI-20091117/"><cite>File API.</cite></a> 17 November 2009. W3C Working Draft. (Work in progress.) URL: <a href="http://www.w3.org/TR/2009/WD-FileAPI-20091117/">http://www.w3.org/TR/2009/WD-FileAPI-20091117/</a> 
</dd><dt id="bib-HTML5">[HTML5]</dt><dd>Ian Hickson; David Hyatt. <a href="http://www.w3.org/TR/2010/WD-html5-20100304/"><cite>HTML 5.</cite></a> 4 March 2010. W3C Working Draft. (Work in progress.) URL: <a href="http://www.w3.org/TR/2010/WD-html5-20100304/">http://www.w3.org/TR/2010/WD-html5-20100304/</a> 
</dd><dt id="bib-HTTP11">[HTTP11]</dt><dd>R. Fielding; et al. <a href="http://www.ietf.org/rfc/rfc2616.txt"><cite>Hypertext Transfer Protocol - HTTP/1.1.</cite></a> June 1999. Internet RFC 2616. URL: <a href="http://www.ietf.org/rfc/rfc2616.txt">http://www.ietf.org/rfc/rfc2616.txt</a> 
</dd><dt id="bib-RFC2119">[RFC2119]</dt><dd>S. Bradner. <a href="http://www.ietf.org/rfc/rfc2119.txt"><cite>Key words for use in RFCs to Indicate Requirement Levels.</cite></a> March 1997. Internet RFC 2119.  URL: <a href="http://www.ietf.org/rfc/rfc2119.txt">http://www.ietf.org/rfc/rfc2119.txt</a> 
</dd><dt id="bib-RFC4627">[RFC4627]</dt><dd>D. Crockford <a href="http://www.ietf.org/rfc/rfc4627.txt">The application/json Media Type for JavaScript Object Notation (JSON)</a> July 2006. Internet RFC 4627. URL: <a href="http://www.ietf.org/rfc/rfc4627.txt">http://www.ietf.org/rfc/rfc4627.txt</a>
</dd><dt id="bib-WEBIDL">[WEBIDL]</dt><dd>Cameron McCormack. <a href="http://www.w3.org/TR/2008/WD-WebIDL-20081219"><cite>Web IDL.</cite></a> 19 December 2008. W3C Working Draft. (Work in progress.) URL: <a href="http://www.w3.org/TR/2008/WD-WebIDL-20081219">http://www.w3.org/TR/2008/WD-WebIDL-20081219</a> 
</dd></dl></div><div id="informative-references" class="section"><h3><span class="secno">B.2 </span>Informative references</h3><dl class="bibliography"><dt id="bib-XMLHTTPREQUEST">[XMLHTTPREQUEST]</dt><dd>Anne van Kesteren. <a href="http://www.w3.org/TR/2008/WD-XMLHttpRequest-20080415"><cite>The XMLHttpRequest Object.</cite></a> 15 April 2008. W3C Working Draft. (Work in progress.) URL: <a href="http://www.w3.org/TR/2008/WD-XMLHttpRequest-20080415">http://www.w3.org/TR/2008/WD-XMLHttpRequest-20080415</a> 
</dd></dl></div></div></body></html>