Annotation of 2006/webapi/XMLHttpRequest/Overview.src.html, revision 1.317
1.248 avankest 1: <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN">
1.1 avankest 2: <html lang="en-US">
3: <head>
1.207 avankest 4: <title>XMLHttpRequest</title>
1.16 avankest 5: <style type="text/css">
1.117 avankest 6: pre.idl { border:solid thin; background:#eee; color:#000; padding:0.5em }
1.16 avankest 7: pre.idl :link, pre.idl :visited { color:inherit; background:transparent }
1.58 avankest 8: pre code { color:inherit; background:transparent }
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1.89 avankest 10: .note { margin-left:2em; font-weight:bold; font-style:italic; color:#008000 }
1.16 avankest 11: p.note::before { content:"Note: " }
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1.269 avankest 17: dl.domintro { color: green; margin: 2em 0 2em 2em; padding: 0.5em 1em; border: none; background: #DDFFDD; }
18: dl.domintro dt, dl.domintro dt * { color: black; text-decoration: none; }
19: dl.domintro dd { margin: 0.5em 0 1em 2em; padding: 0; }
20: dl.domintro dd p { margin: 0.5em 0; }
21: dl.domintro:before { display: table; margin: -1em -0.5em -0.5em auto; width: auto; content: 'This box is non-normative. Implementation requirements are given below this box.'; color: red; border: solid 2px; background: white; padding: 0 0.25em; }
1.16 avankest 22: em.ct { text-transform:lowercase; font-variant:small-caps; font-style:normal }
23: dfn { font-weight:bold; font-style:normal }
24: code { color:orangered }
25: code :link, code :visited { color:inherit }
1.203 avankest 26: hr:not(.top) { display:block; background:none; border:none; padding:0; margin:2em 0; height:auto }
27: table { border-collapse:collapse; border-style:hidden hidden none hidden }
28: table thead { border-bottom:solid }
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30: table td, table th { border-left:solid; border-right:solid; border-bottom:solid thin; vertical-align:top; padding:0.2em }
1.16 avankest 31: </style>
1.147 avankest 32: <link rel="stylesheet" href="http://www.w3.org/StyleSheets/TR/W3C-[STATUS]">
1.1 avankest 33: </head>
34: <body>
35: <div class="head">
36: <p><a href="http://www.w3.org/"><img height="48" width="72" alt="W3C" src="http://www.w3.org/Icons/w3c_home"></a></p>
1.12 avankest 37:
1.229 avankest 38: <h1 class="head" id="the-xmlhttprequest-object">XMLHttpRequest</h1>
1.248 avankest 39:
1.12 avankest 40:
1.149 avankest 41: <h2 class="no-num no-toc" id="w3c-doctype">[LONGSTATUS] [DATE: 3 August 2002]</h2>
1.12 avankest 42:
1.1 avankest 43: <dl>
1.10 avankest 44: <dt>This Version:</dt>
1.291 avankest 45: <dd><a href="[VERSION]/">http://www.w3.org/TR/[YEAR]/ED-XMLHttpRequest-[CDATE]/</a></dd>
1.14 avankest 46:
1.10 avankest 47: <dt>Latest Version:</dt>
1.1 avankest 48: <dd><a href="http://www.w3.org/TR/XMLHttpRequest/">http://www.w3.org/TR/XMLHttpRequest/</a></dd>
1.203 avankest 49:
1.189 avankest 50: <dt>Latest Editor Version:</dt>
51: <dd><a href="http://dev.w3.org/2006/webapi/XMLHttpRequest/">http://dev.w3.org/2006/webapi/XMLHttpRequest/</a></dd>
1.14 avankest 52:
1.10 avankest 53: <dt>Previous Versions:</dt>
1.248 avankest 54:
1.291 avankest 55: <dd><a href="http://www.w3.org/TR/2010/CR-XMLHttpRequest-20100803/">http://www.w3.org/TR/2010/CR-XMLHttpRequest-20100803/</a></dd>
1.288 avankest 56: <dd><a href="http://www.w3.org/TR/2009/WD-XMLHttpRequest-20091119/">http://www.w3.org/TR/2009/WD-XMLHttpRequest-20091119/</a></dd>
1.231 avankest 57: <dd><a href="http://www.w3.org/TR/2009/WD-XMLHttpRequest-20090820/">http://www.w3.org/TR/2009/WD-XMLHttpRequest-20090820/</a></dd>
1.173 avankest 58: <dd><a href="http://www.w3.org/TR/2008/WD-XMLHttpRequest-20080415/">http://www.w3.org/TR/2008/WD-XMLHttpRequest-20080415/</a></dd>
1.154 avankest 59: <dd><a href="http://www.w3.org/TR/2007/WD-XMLHttpRequest-20071026/">http://www.w3.org/TR/2007/WD-XMLHttpRequest-20071026/</a></dd>
1.133 avankest 60: <dd><a href="http://www.w3.org/TR/2007/WD-XMLHttpRequest-20070618/">http://www.w3.org/TR/2007/WD-XMLHttpRequest-20070618/</a></dd>
1.58 avankest 61: <dd><a href="http://www.w3.org/TR/2007/WD-XMLHttpRequest-20070227/">http://www.w3.org/TR/2007/WD-XMLHttpRequest-20070227/</a></dd>
1.22 avankest 62: <dd><a href="http://www.w3.org/TR/2006/WD-XMLHttpRequest-20060927/">http://www.w3.org/TR/2006/WD-XMLHttpRequest-20060927/</a></dd>
1.1 avankest 63: <dd><a href="http://www.w3.org/TR/2006/WD-XMLHttpRequest-20060619/">http://www.w3.org/TR/2006/WD-XMLHttpRequest-20060619/</a></dd>
64: <dd><a href="http://www.w3.org/TR/2006/WD-XMLHttpRequest-20060405/">http://www.w3.org/TR/2006/WD-XMLHttpRequest-20060405/</a></dd>
1.248 avankest 65:
66:
1.14 avankest 67:
1.1 avankest 68: <dt>Editor:</dt>
69: <dd><a href="http://annevankesteren.nl/">Anne van Kesteren</a>
70: (<a href="http://www.opera.com/">Opera Software ASA</a>)
71: <<a href="mailto:annevk@opera.com">annevk@opera.com</a>></dd>
72: </dl>
1.14 avankest 73:
1.1 avankest 74: <p class="copyright"><a href="http://www.w3.org/Consortium/Legal/ipr-notice#Copyright">Copyright</a>
1.315 avankest 75: © 2010
1.51 avankest 76: <a href="http://www.w3.org/"><acronym title="World Wide Web Consortium">W3C</acronym></a><sup>®</sup>
77: (<a href="http://www.csail.mit.edu/"><acronym title="Massachusetts Institute of Technology">MIT</acronym></a>,
78: <a href="http://www.ercim.org/"><acronym title="European Research Consortium for Informatics and Mathematics">ERCIM</acronym></a>,
79: <a href="http://www.keio.ac.jp/">Keio</a>), All Rights Reserved. W3C
80: <a href="http://www.w3.org/Consortium/Legal/ipr-notice#Legal_Disclaimer">liability</a>,
81: <a href="http://www.w3.org/Consortium/Legal/ipr-notice#W3C_Trademarks">trademark</a>
82: and
83: <a href="http://www.w3.org/Consortium/Legal/copyright-documents">document
84: use</a> rules apply.</p>
1.1 avankest 85: </div>
1.12 avankest 86:
1.1 avankest 87: <hr>
1.12 avankest 88:
1.1 avankest 89: <h2 class="no-num no-toc" id="specabstract">Abstract</h2>
1.10 avankest 90:
1.248 avankest 91:
92:
1.229 avankest 93: <p>The XMLHttpRequest specification defines an API
1.207 avankest 94: that provides scripted client functionality for transferring data between
95: a client and a server.</p>
1.248 avankest 96:
1.12 avankest 97:
1.1 avankest 98: <h2 class="no-num no-toc" id="sotd">Status of this Document</h2>
1.12 avankest 99:
1.1 avankest 100: <p><em>This section describes the status of this document at the time of its
1.36 avankest 101: publication. Other documents may supersede this document. A list of current
102: W3C publications and the latest revision of this technical report can be
103: found in the <a href="http://www.w3.org/TR/">W3C technical reports index</a>
1.117 avankest 104: at http://www.w3.org/TR/.</em></p>
1.36 avankest 105:
1.248 avankest 106: <p>This is the [DATE: 3 August 2002] <!--Last Call Working Draft-->[LONGSTATUS] of
107: XMLHttpRequest. Please send comments to
108: <a href="mailto:public-webapps@w3.org?subject=[XHR]%20">public-webapps@w3.org</a>
1.207 avankest 109: (<a href="http://lists.w3.org/Archives/Public/public-webapps/">archived</a>)
1.248 avankest 110: with <samp>[XHR]</samp> at the start of the subject line.</p>
1.295 avankest 111:
1.287 avankest 112:
113: <p>For the last Last Call Working Draft the Working Group has kept a
114: <a href="http://dev.w3.org/2006/webapi/XMLHttpRequest/disposition-of-comments-3">disposition of comments</a>
1.290 avankest 115: document. A
116: <a href="http://dev.w3.org/cvsweb/2006/webapi/XMLHttpRequest/Overview.src.html">list of changes</a>
117: is available via a Web view of CVS. (Due to the way the document is edited
118: certain commit messages have introduced negligible changes to this
119: document and are in fact only relevant for XMLHttpRequest Level 2.)</p>
1.291 avankest 120:
1.51 avankest 121:
1.47 avankest 122: <p>This document is produced by the
1.248 avankest 123: <a href="http://www.w3.org/2008/webapps/">Web Applications</a> (WebApps) Working Group.
124: The WebApps Working Group is part of the
1.207 avankest 125: <a href="http://www.w3.org/2006/rwc/Activity">Rich Web Clients Activity</a>
1.248 avankest 126: in the W3C <a href="http://www.w3.org/Interaction/">Interaction Domain</a>.</p>
1.12 avankest 127:
1.1 avankest 128: <p>This document was produced by a group operating under the
1.248 avankest 129: <a href="http://www.w3.org/Consortium/Patent-Policy-20040205/">5 February 2004
130: W3C Patent Policy</a>. W3C maintains a
1.207 avankest 131: <a rel="disclosure" href="http://www.w3.org/2004/01/pp-impl/42538/status">public
1.248 avankest 132: list of any patent disclosures</a> made in connection with the deliverables of
133: the group; that page also includes instructions for disclosing a patent. An
134: individual who has actual knowledge of a patent which the individual believes
135: contains
1.36 avankest 136: <a href="http://www.w3.org/Consortium/Patent-Policy-20040205/#def-essential">Essential
137: Claim(s)</a> must disclose the information in accordance with
138: <a href="http://www.w3.org/Consortium/Patent-Policy-20040205/#sec-Disclosure">section
139: 6 of the W3C Patent Policy</a>.</p>
1.12 avankest 140:
1.291 avankest 141: <p>Publication as a Working Draft does not imply endorsement by the W3C
1.248 avankest 142: Membership. This is a draft document and may be updated, replaced or
143: obsoleted by other documents at any time. It is inappropriate to cite this
144: document as other than work in progress.</p>
1.295 avankest 145:
1.307 avankest 146:
1.268 avankest 147: <h3 class="no-num no-toc" id="crec">Candidate Recommendation Exit Criteria</h3>
148:
149: <p>To exit the Candidate Recommendation (CR) stage the following criteria
150: <em class="ct">must</em> have been met:</p>
151:
152: <ol>
153: <li>There will be at least two interoperable implementations passing all
1.286 avankest 154: test cases in the
155: <a href="http://test.w3.org/webapps/tests/XMLHttpRequest/info.htm">test suite</a>
156: for this specification. An implementation is to be available (i.e. for
157: download), shipping (i.e. not private), and not experimental (i.e.
158: intended for a wide audience). The working group will decide when the
1.290 avankest 159: test suite is of sufficient quality to test interoperability and will
160: produce implementation reports (hosted together with the test suite).</li>
1.268 avankest 161:
1.291 avankest 162: <li>A minimum of six months of the CR stage will have elapsed. This is to
1.268 avankest 163: ensure that enough time is given for any remaining major errors to be
164: caught. The CR period will be extended if implementations are slow to
1.291 avankest 165: appear.</li> <!-- XXX need to add date -->
1.282 avankest 166:
1.283 avankest 167: <li>Text, which can be in a separate document, exists that explains the
168: security considerations for this specification. This may be done in a
169: generic manner as they are most likely applicable to various APIs. The
170: working group will decide whether the text is of sufficient quality.</li>
1.268 avankest 171: </ol>
1.307 avankest 172:
1.207 avankest 173:
174:
1.1 avankest 175: <h2 class="no-num no-toc" id="toc">Table of Contents</h2>
1.21 avankest 176:
1.1 avankest 177: <!--toc-->
1.12 avankest 178:
1.207 avankest 179:
180:
1.1 avankest 181: <h2 id="introduction">Introduction</h2>
1.12 avankest 182:
1.1 avankest 183: <p><em>This section is non-normative.</em></p>
1.12 avankest 184:
1.183 avankest 185: <p>The <code>XMLHttpRequest</code> object implements an interface exposed
186: by a scripting engine that allows scripts to perform HTTP client
187: functionality, such as submitting form data or loading data from a
188: server. It is the ECMAScript HTTP API.</p>
1.24 avankest 189:
1.1 avankest 190: <p>The name of the object is <code>XMLHttpRequest</code> for compatibility
1.183 avankest 191: with the Web, though each component of this name is potentially
192: misleading. First, the object supports any text based format, including
193: XML. Second, it can be used to make requests over both HTTP and HTTPS
194: (some implementations support protocols in addition to HTTP and HTTPS, but
195: that functionality is not covered by this specification). Finally, it
196: supports "requests" in a broad sense of the term as it pertains to HTTP;
197: namely all activity involved with HTTP requests or responses for the
198: defined HTTP methods.</p>
1.12 avankest 199:
1.14 avankest 200: <div class="example">
1.250 avankest 201: <p>Some simple code to do something with data from an XML document
202: fetched over the network:</p>
1.16 avankest 203:
1.308 avankest 204: <pre><code>function processData(data) {
1.312 avankest 205: // taking care of data
1.14 avankest 206: }
207:
208: function handler() {
1.312 avankest 209: if(this.readyState == this.DONE) {
210: if(this.status == 200 &&
211: this.responseXML != null &&
212: this.responseXML.getElementById('test').textContent) {
1.308 avankest 213: // success!
214: processData(this.responseXML.getElementById('test').textContent);
215: return;
216: }
1.312 avankest 217: // something went wrong
218: processData(null);
1.308 avankest 219: }
1.14 avankest 220: }
1.12 avankest 221:
1.14 avankest 222: var client = new XMLHttpRequest();
223: client.onreadystatechange = handler;
1.250 avankest 224: client.open("GET", "unicorn.xml");
1.58 avankest 225: client.send();</code></pre>
1.16 avankest 226:
1.56 avankest 227: <p>If you just want to log a message to the server:</p>
1.16 avankest 228:
1.58 avankest 229: <pre><code>function log(message) {
1.308 avankest 230: var client = new XMLHttpRequest();
231: client.open("POST", "/log");
232: client.setRequestHeader("Content-Type", "text/plain;charset=UTF-8");
233: client.send(message);
1.58 avankest 234: }</code></pre>
1.16 avankest 235:
1.14 avankest 236: <p>Or if you want to check the status of a document on the server:</p>
1.16 avankest 237:
1.58 avankest 238: <pre><code>function fetchStatus(address) {
1.308 avankest 239: var client = new XMLHttpRequest();
240: client.onreadystatechange = function() {
241: // in case of network errors this might not give reliable results
1.310 avankest 242: if(this.readyState == this.DONE)
1.308 avankest 243: returnStatus(this.status);
244: }
245: client.open("HEAD", address);
246: client.send();
1.58 avankest 247: }</code></pre>
1.14 avankest 248: </div>
1.12 avankest 249:
1.203 avankest 250:
251:
1.248 avankest 252:
253: <h2 id="conformance">Conformance Criteria</h2>
1.12 avankest 254:
1.27 avankest 255: <p>Everything in this specification is normative except for diagrams,
256: examples, notes and sections marked non-normative.</p>
1.12 avankest 257:
1.1 avankest 258: <p>The key words <em class="ct">must</em>, <em class="ct">must not</em>,
1.259 avankest 259: <em class="ct">should</em>, <em class="ct">should not</em>, and
260: <em class="ct">may</em> in this document are to be interpreted as
261: described in RFC 2119. [<cite><span>RFC2119</span></cite>]</p>
1.12 avankest 262:
1.299 avankest 263: <p>This specification defines a single conformance class:</p>
1.12 avankest 264:
1.1 avankest 265: <dl>
1.74 avankest 266: <dt><dfn id="conforming-user-agent">Conforming user agent</dfn></dt>
1.24 avankest 267:
1.74 avankest 268: <dd>
269: <p>A user agent <em class="ct">must</em> behave as described in this
1.106 avankest 270: specification in order to be considered conformant.</p>
1.95 avankest 271:
1.140 avankest 272: <p>User agents <em class="ct">may</em> implement algorithms given in
273: this specification in any way desired, so long as the end result is
274: indistinguishable from the result that would be obtained by the
275: specification's algorithms.</p>
1.110 avankest 276:
1.95 avankest 277: <p class="note">This specification uses both the terms "conforming user
278: agent(s)" and "user agent(s)" to refer to this product class.</p>
1.74 avankest 279: </dd>
1.1 avankest 280: </dl>
1.32 avankest 281:
1.153 avankest 282: <h3 id="dependencies">Dependencies</h3>
1.33 avankest 283:
1.29 avankest 284: <p>This specification relies on several underlying specifications.</p>
1.248 avankest 285:
1.29 avankest 286: <dl>
1.248 avankest 287:
288:
1.29 avankest 289: <dt>DOM</dt>
1.310 avankest 290: <dd><p>A <span>conforming user agent</span> <em class="ct">must</em>
291: support at least the subset of the functionality defined in DOM Events
292: and DOM Core that this specification relies upon, such as various
293: exceptions and <code>EventTarget</code>.
1.155 avankest 294: [<cite><span>DOM2Events</span></cite>]
295: [<cite><span>DOM3Core</span></cite>]</p></dd>
1.29 avankest 296:
1.310 avankest 297:
298:
1.250 avankest 299: <dt>HTML5</dt>
1.161 avankest 300: <dd>
1.189 avankest 301: <p>A <span>conforming user agent</span> <em class="ct">must</em> support
1.250 avankest 302: at least the subset of the functionality defined in HTML5 that
1.197 avankest 303: this specification relies upon, such as the basics of the
304: <code>Window</code> object and serializing a <code>Document</code>
305: object. [<cite><span>HTML5</span></cite>]</p>
1.161 avankest 306:
307: <p class="note">The
308: <a href="http://www.w3.org/TR/2006/WD-Window-20060407/">Window Object
309: 1.0</a> draft is not referenced normatively as it appears to be no
1.250 avankest 310: longer maintained and HTML5 defines the <code>Window</code> object in
311: more detail. This specification already depends on HTML5 for other
312: reasons so there is not much additional overhead because of this.</p>
1.299 avankest 313: </dd>
1.161 avankest 314:
1.29 avankest 315: <dt>HTTP</dt>
1.299 avankest 316: <dd><p>A <span>conforming user agent</span> <em class="ct">must</em>
317: support some version of the HTTP protocol. Requirements regarding HTTP
318: are made throughout the specification.
1.248 avankest 319: [<cite><span>RFC2616</span></cite>]</p></dd>
1.189 avankest 320:
1.181 avankest 321: <dt>Web IDL</dt>
1.248 avankest 322: <dd><p>A <span>conforming user agent</span> <em class="ct">must</em> also
323: be a conforming implementation of the IDL fragments in this
324: specification, as described in the Web IDL specification.
1.299 avankest 325: [<cite><span>WebIDL</span></cite>]</p></dd>
1.248 avankest 326:
1.299 avankest 327: <dt>XML</dt>
328: <dd><p>A <span>conforming user agent</span> <em class="ct">must</em> be a
329: conforming XML processor that reports violations of namespace
330: well-formedness. [<cite><span>XML</span></cite>]</p></dd>
1.29 avankest 331: </dl>
1.12 avankest 332:
1.157 avankest 333:
1.153 avankest 334: <h3 id="terminology">Terminology</h3>
1.209 avankest 335:
1.281 avankest 336: <p><dfn id="dfn-obtain-unicode">Convert a DOMString to a sequence of Unicode characters</dfn>
1.233 avankest 337: is defined by the Web IDL specification.
338: [<cite><span>WebIDL</span></cite>]</p>
1.266 avankest 339:
1.248 avankest 340:
1.292 avankest 341:
1.200 avankest 342: <p>The terms and algorithms
1.257 avankest 343: <dfn id="url-fragment"><code><fragment></code></dfn>,
344: <dfn id="url-scheme"><code><scheme></code></dfn>,
1.265 avankest 345: <dfn id="cookie-free-document-object">cookie-free <code>Document</code> object</dfn>,
1.203 avankest 346: <dfn id="document-base-url">document base URL</dfn>,
1.244 avankest 347: <dfn id="document-character-encoding">document's character encoding</dfn>,
1.205 avankest 348: <dfn id="event-handler-attributes-0">event handler attributes</dfn>,
1.203 avankest 349: <dfn id="event-handler-event-type">event handler event type</dfn>,
1.260 avankest 350: <dfn id="fetch">fetch</dfn>,
1.203 avankest 351: <dfn id="fully-active">fully active</dfn>,
1.206 avankest 352: <dfn id="function"><code>Function</code></dfn>,
1.302 avankest 353: <dfn id="html-documents">HTML documents</dfn>,
1.225 avankest 354: <dfn id="dom-innerhtml" title="dom-innerHTML"><code>innerHTML</code></dfn>,
1.200 avankest 355: <dfn id="origin">origin</dfn>,
1.232 avankest 356: <dfn id="preferred-mime-name">preferred MIME name</dfn>,
1.203 avankest 357: <dfn id="resolve-a-url">resolve a URL</dfn>,
358: <dfn id="same-origin">same origin</dfn>,
359: <dfn id="storage-mutex">storage mutex</dfn>,
360: <dfn id="task">task</dfn>,
361: <dfn id="task-source">task source</dfn>,
1.252 avankest 362: <dfn id="task-queues">task queues</dfn>,
1.203 avankest 363: <dfn id="url">URL</dfn>,
1.232 avankest 364: <dfn id="url-character-encoding">URL character encoding</dfn>,
365: <dfn id="queue-a-task">queue a task</dfn>, and
366: <dfn id="valid-mime-type">valid MIME type</dfn>
1.250 avankest 367: are defined by the HTML5 specification.
1.157 avankest 368: [<cite><span>HTML5</span></cite>]</p>
1.210 avankest 369:
1.203 avankest 370: <p>The term <dfn id="entity-body">entity body</dfn> is used as described
371: in RFC 2616. <dfn id="method-token">Method token</dfn> is used as
372: described in section 5.1.1 of RFC 2616. <dfn><code>field-name</code></dfn>
373: and <dfn><code>field-value</code></dfn> are used as described in section
374: 4.2 of RFC 2616. [<cite><span>RFC2616</span></cite>]</p>
1.218 avankest 375:
1.258 avankest 376: <p>To <dfn>deflate a DOMString into a byte sequence</dfn> means to create
377: a sequence of bytes such that the <var title="">n</var>th byte of the
378: sequence is equal to the low-order byte of the <var title="">n</var>th
379: code point in the original DOMString.</p>
380:
381: <p>To <dfn>inflate a byte sequence into a DOMString</dfn> means to create
382: a DOMString such that the <var title="">n</var>th code point has 0x00 as
383: the high-order byte and the <var title="">n</var>th byte of the byte
384: sequence as the low-order byte.</p>
1.256 avankest 385:
1.203 avankest 386: <p><dfn><code>userinfo</code></dfn> is used as described in section 3.2.1
387: of RFC 3986. [<cite><span>RFC3986</span></cite>]</p>
388:
389: <p>To <dfn id="dispatch-readystatechange-event">dispatch a
390: <code>readystatechange</code> event</dfn> means that an event with the
1.273 avankest 391: name <code title="event-xhr-readystatechange">readystatechange</code>, which does not bubble and is not
1.232 avankest 392: cancelable, and which uses the <code>Event</code> interface, is to be
393: dispatched at the <code>XMLHttpRequest</code> object.</p>
1.80 avankest 394:
1.248 avankest 395:
396:
1.153 avankest 397: <h3 id="extensibility">Extensibility</h3>
1.12 avankest 398:
1.250 avankest 399: <p>User agents, Working Groups, and other interested parties are
400: <em>strongly encouraged</em> to discuss extensions on a relevant public
401: forum, preferably
402: <a href="mailto:public-webapps@w3.org">public-webapps@w3.org</a>. If this
403: is for some reason not possible prefix the extension in some way and start
404: the prefix with an uppercase letter. E.g. if company Foo wants to add a
405: private method <code>bar()</code> it could be named <code>FooBar()</code>
406: to prevent clashes with a potential future standardized
407: <code>bar()</code>.</p>
1.12 avankest 408:
1.153 avankest 409:
1.223 avankest 410: <h2>The <code title="">XMLHttpRequest</code> Interface</h2>
1.12 avankest 411:
1.58 avankest 412: <p>The <code>XMLHttpRequest</code> object can be used by scripts to
1.22 avankest 413: programmatically connect to their originating server via HTTP.</p>
1.12 avankest 414:
1.228 avankest 415: <pre class="idl">[NoInterfaceObject]
416: interface <dfn id="xmlhttprequesteventtarget">XMLHttpRequestEventTarget</dfn> : EventTarget {
417: // for future use
418: };
419:
1.240 avankest 420: [<span title="dom-XMLHttpRequest">Constructor</span>]
1.228 avankest 421: interface <dfn id="xmlhttprequest">XMLHttpRequest</dfn> : <span>XMLHttpRequestEventTarget</span> {
1.206 avankest 422: // <a href="#event-handler-attributes">event handler attributes</a>
1.273 avankest 423: attribute <span>Function</span> <span title="handler-xhr-onreadystatechange">onreadystatechange</span>;
1.58 avankest 424:
1.205 avankest 425: // <a href="#states">states</a>
1.272 avankest 426: const unsigned short <span title="dom-XMLHttpRequest-UNSENT">UNSENT</span> = 0;
427: const unsigned short <span title="dom-XMLHttpRequest-OPENED">OPENED</span> = 1;
428: const unsigned short <span title="dom-XMLHttpRequest-HEADERS_RECEIVED">HEADERS_RECEIVED</span> = 2;
429: const unsigned short <span title="dom-XMLHttpRequest-LOADING">LOADING</span> = 3;
430: const unsigned short <span title="dom-XMLHttpRequest-DONE">DONE</span> = 4;
1.277 avankest 431: readonly attribute unsigned short <span title="dom-XMLHttpRequest-readyState">readyState</span>;
1.58 avankest 432:
1.205 avankest 433: // <a href="#request">request</a>
1.274 avankest 434: void <span title="dom-XMLHttpRequest-open">open</span>(DOMString <var>method</var>, DOMString <var title="">url</var>);
435: void <span title="dom-XMLHttpRequest-open">open</span>(DOMString <var>method</var>, DOMString <var title="">url</var>, boolean <var>async</var>);
436: void <span title="dom-XMLHttpRequest-open">open</span>(DOMString <var>method</var>, DOMString <var title="">url</var>, boolean <var>async</var>, DOMString? <var>user</var>);
437: void <span title="dom-XMLHttpRequest-open">open</span>(DOMString <var>method</var>, DOMString <var title="">url</var>, boolean <var>async</var>, DOMString? <var>user</var>, DOMString? <var>password</var>);
1.279 avankest 438: void <span title="dom-XMLHttpRequest-setRequestHeader">setRequestHeader</span>(DOMString <var>header</var>, DOMString <var>value</var>);
1.271 avankest 439: void <span title="dom-XMLHttpRequest-send">send</span>();
1.305 avankest 440: void <span title="dom-XMLHttpRequest-send">send</span>(<span>Document</span> <var>data</var>);
1.271 avankest 441: void <span title="dom-XMLHttpRequest-send">send</span>([AllowAny] DOMString? <var>data</var>);
1.275 avankest 442: void <span title="dom-XMLHttpRequest-abort">abort</span>();
1.58 avankest 443:
1.205 avankest 444: // <a href="#response">response</a>
1.276 avankest 445: readonly attribute unsigned short <span title="dom-XMLHttpRequest-status">status</span>;
446: readonly attribute DOMString <span title="dom-XMLHttpRequest-statusText">statusText</span>;
1.278 avankest 447: DOMString <span title="dom-XMLHttpRequest-getResponseHeader">getResponseHeader</span>(DOMString <var>header</var>);
448: DOMString <span title="dom-XMLHttpRequest-getAllResponseHeaders">getAllResponseHeaders</span>();
1.276 avankest 449: readonly attribute DOMString <span title="dom-XMLHttpRequest-responseText">responseText</span>;
1.305 avankest 450: readonly attribute <span>Document</span> <span title="dom-XMLHttpRequest-responseXML">responseXML</span>;
1.228 avankest 451: };</pre>
1.8 avankest 452:
1.235 avankest 453:
1.124 avankest 454:
1.203 avankest 455: <h3>Origin and Base URL</h3>
456:
457: <p>Each <code>XMLHttpRequest</code> object has an associated
458: <dfn id="xmlhttprequest-origin"><code>XMLHttpRequest</code> origin</dfn>
459: and an
460: <dfn id="xmlhttprequest-base-url"><code>XMLHttpRequest</code> base URL</dfn>.
461:
462: <p>This specification defines their values when the global object is
463: represented by the <code>Window</code> object. When the
1.246 avankest 464: <code>XMLHttpRequest</code> object is used in other contexts their values
1.203 avankest 465: will have to be defined as appropriate for that context. That is
466: considered to be out of scope for this specification.</p>
467:
468: <p>In environments where the global object is represented by the
469: <code>Window</code> object the <code>XMLHttpRequest</code> object has an
470: associated
471: <dfn id="xmlhttprequest-document"><code>XMLHttpRequest</code> <code>Document</code></dfn>
472: which is the <code>Document</code> object associated with the
473: <code>Window</code> object for which the <code>XMLHttpRequest</code>
474: interface object was created.</p>
475:
476: <p class="note">The
477: <span><code>XMLHttpRequest</code> <code>Document</code></span> is used to
478: determine the <span><code>XMLHttpRequest</code> origin</span> and
479: <span><code>XMLHttpRequest</code> base URL</span> at a later stage.</p>
480:
481:
1.263 avankest 482:
1.203 avankest 483: <h3>Task Sources</h3>
1.218 avankest 484:
1.251 avankest 485: <p>The <span>task source</span> used by this specification is the
486: <dfn><code>XMLHttpRequest</code> task source</dfn>.</p>
1.203 avankest 487:
488:
1.211 avankest 489: <h3 id="constructors">Constructors</h3>
1.203 avankest 490:
1.263 avankest 491:
492:
1.270 avankest 493: <dl class="domintro">
494: <dt><var title="">client</var> = new <code title="dom-XMLHttpRequest">XMLHttpRequest</code>()</dt>
495: <dd>Returns a new <code>XMLHttpRequest</code> object.</dd>
496:
497: </dl>
1.295 avankest 498:
1.203 avankest 499: <p>When the
1.266 avankest 500: <dfn id="dom-xmlhttprequest" title="dom-XMLHttpRequest"><code>XMLHttpRequest()</code></dfn>
1.203 avankest 501: constructor is invoked, the user agent <em class="ct">must</em> return a
502: new <code>XMLHttpRequest</code> object.</p>
503:
1.263 avankest 504:
1.203 avankest 505:
1.205 avankest 506: <h3 id="event-handler-attributes">Event Handler Attributes</h3>
507:
1.248 avankest 508:
509:
1.205 avankest 510: <p>The following is the
511: <span title="event handler attributes">event handler attribute</span> (and
512: its corresponding <span>event handler event type</span>) that
513: <em class="ct">must</em> be supported as DOM attribute by the
514: <code>XMLHttpRequest</code> object:</p>
515:
516: <table>
517: <thead>
518: <tr>
519: <th><span title="event handler attributes">event handler attribute</span>
520: <th><span>event handler event type</span>
521: <tbody>
522: <tr>
1.273 avankest 523: <td><dfn id="handler-xhr-onreadystatechange" title="handler-xhr-onreadystatechange"><code>onreadystatechange</code></dfn>
524: <td><code title="event-xhr-readystatechange">readystatechange</code></td>
1.205 avankest 525: </table>
526:
527:
528: <h3 id="states">States</h3>
1.295 avankest 529:
1.277 avankest 530: <dl class="domintro">
531: <dt><var title="">client</var> . <code title="dom-XMLHttpRequest-readyState">readyState</code></dt>
532: <dd><p>Returns the current state.</p></dd>
533: </dl>
1.203 avankest 534:
535: <p>The <code>XMLHttpRequest</code> object can be in several states. The
1.277 avankest 536: <dfn id="dom-xmlhttprequest-readystate" title="dom-XMLHttpRequest-readyState"><code>readyState</code></dfn>
537: attribute <em class="ct">must</em> return the current state, which
1.203 avankest 538: <em class="ct">must</em> be one of the following values:</p>
539:
540: <dl>
1.272 avankest 541: <dt><dfn id="dom-xmlhttprequest-unsent" title="dom-XMLHttpRequest-UNSENT"><code>UNSENT</code></dfn>
1.203 avankest 542: (numeric value 0)</dt>
543: <dd><p>The object has been constructed.</p></dd>
544:
1.272 avankest 545: <dt><dfn id="dom-xmlhttprequest-opened" title="dom-XMLHttpRequest-OPENED"><code>OPENED</code></dfn>
1.203 avankest 546: (numeric value 1)</dt>
1.274 avankest 547: <dd><p>The <code title="dom-XMLHttpRequest-open">open()</code> method has been successfully invoked.
1.203 avankest 548: During this state request headers can be set using
1.279 avankest 549: <code title="dom-XMLHttpRequest-setRequestHeader">setRequestHeader()</code>
550: and the request can be made using the
1.271 avankest 551: <code title="dom-XMLHttpRequest-send">send()</code> method.</p></dd>
1.203 avankest 552:
1.272 avankest 553: <dt><dfn id="dom-xmlhttprequest-headers_received" title="dom-XMLHttpRequest-HEADERS_RECEIVED"><code>HEADERS_RECEIVED</code></dfn>
1.203 avankest 554: (numeric value 2)</dt>
1.257 avankest 555: <dd><p>All redirects (if any) have been followed and all HTTP headers of
556: the final response have been received. Several response members of the
557: object are now available.</p></dd>
1.203 avankest 558:
1.272 avankest 559: <dt><dfn id="dom-xmlhttprequest-loading" title="dom-XMLHttpRequest-LOADING"><code>LOADING</code></dfn>
1.203 avankest 560: (numeric value 3)</dt>
561: <dd><p>The <span>response entity body</span> is being received.</p></dd>
562:
1.272 avankest 563: <dt><dfn id="dom-xmlhttprequest-done" title="dom-XMLHttpRequest-DONE"><code>DONE</code></dfn>
1.203 avankest 564: (numeric value 4)</dt>
565: <dd><p>The data transfer has been completed or something went wrong
566: during the transfer (e.g. infinite redirects).</p></dd>
567: </dl>
568:
1.272 avankest 569: <p>The <span title="dom-XMLHttpRequest-OPENED">OPENED</span> state has an associated
1.203 avankest 570: <dfn id="send-flag"><code>send()</code> flag</dfn> that indicates whether
1.271 avankest 571: the <code title="dom-XMLHttpRequest-send">send()</code> method has been
572: invoked. It can be either true or false and has an initial value of
573: false.</p>
1.203 avankest 574:
1.310 avankest 575: <p>The <dfn id="error-flag">error flag</dfn> indicates some type of
576: network error or abortion. It is used during the
577: <span title="dom-XMLHttpRequest-DONE">DONE</span> state. It can be either
578: true or false and has an initial value of false.</p>
1.203 avankest 579:
580:
1.205 avankest 581: <h3 id="request">Request</h3>
1.203 avankest 582:
583: <p>The <code>XMLHttpRequest</code> object holds the following request
584: metadata variables:</p>
585:
1.204 avankest 586: <dl>
587: <dt>The <dfn>asynchronous flag</dfn></dt>
1.266 avankest 588: <dd>True when <span title="fetch">fetching</span> is done asychronously.
589: False when fetching is done synchronously.</dd>
1.204 avankest 590:
591: <dt>The <dfn>request method</dfn></dt>
1.310 avankest 592: <dd>The HTTP method used in the request.</dd>
1.204 avankest 593:
594: <dt>The <dfn>request URL</dfn></dt>
1.312 avankest 595: <dd>The resolved <span>URL</span> used in the request.</dd>
1.218 avankest 596:
1.204 avankest 597: <dt>The <dfn>request username</dfn></dt>
598: <dd>The username used in the request or null if there is no
599: username.</dd>
1.218 avankest 600:
1.204 avankest 601: <dt>The <dfn>request password</dfn></dt>
602: <dd>The password used in the request or null if there is no
603: password.</dd>
1.218 avankest 604:
1.204 avankest 605: <dt>The <dfn id="author-request-headers">author request headers</dfn></dt>
606: <dd>A list consisting of HTTP header name/value pairs to be used in the
607: request.</p>
1.203 avankest 608:
1.204 avankest 609: <dt>The <dfn>request entity body</dfn></dt>
1.310 avankest 610: <dd>The <span>entity body</span> used in the request or null if there is
611: no <span>entity body</span>.</dd>
1.295 avankest 612:
1.248 avankest 613:
1.204 avankest 614: </dl>
1.203 avankest 615:
1.248 avankest 616:
617:
1.203 avankest 618:
619: <h4>The <code title="">open()</code> method</h4>
1.295 avankest 620:
1.269 avankest 621: <dl class="domintro">
1.274 avankest 622: <dt><var title="">client</var> . <code title="dom-XMLHttpRequest-open">open(<var title="">method</var>,
623: <var title="">url</var>, <var title="">async</var>, <var title="">user</var>,
624: <var title="">password</var>)</code></dt>
1.269 avankest 625:
1.280 avankest 626: <dd>
627: <p>Sets the <span>request method</span>, <span>request URL</span>,
628: <span>asynchronous flag</span>, <span>request username</span>, and
629: <span>request password</span>.</p>
1.295 avankest 630:
1.280 avankest 631: <p>Throws a <code>SYNTAX_ERR</code> exception if one of the following is
632: true:</p>
1.295 avankest 633:
1.280 avankest 634: <ul>
635: <li><var title="">method</var> is not a valid HTTP method.</li>
636: <li><var title="">url</var> cannot be resolved.</li>
637: <li><var title="">url</var> contains the <code>"user:password"</code>
638: format in the <code>userinfo</code> production.</li>
639: </ul>
1.295 avankest 640:
1.280 avankest 641: <p>Throws a <code>SECURITY_ERR</code> exception if
642: <var title="">method</var> is a case-insensitive match for
643: <code>CONNECT</code>, <code>TRACE</code> or <code>TRACK</code>.</p>
1.295 avankest 644:
1.300 avankest 645: <p>Throws an <code>INVALID_ACCESS_ERR</code> exception if either
646: <var title="">user</var> or <var title="">password</var> is passed as
647: argument and the <span>origin</span> of <var title="">url</var> does not
648: match the <span><code>XMLHttpRequest</code> origin</span>.</p>
1.280 avankest 649: </dd>
1.269 avankest 650: </dl>
1.88 avankest 651:
1.274 avankest 652: <p>When the
653: <dfn id="dom-xmlhttprequest-open" title="dom-XMLHttpRequest-open"><code>open(<var title="">method</var>, <var title="">url</var>, <var title="">async</var>, <var title="">user</var>, <var title="">password</var>)</code></dfn>
654: method is invoked, the user agent <em class="ct">must</em> run these steps
655: (unless otherwise indicated):</p>
1.90 avankest 656:
1.88 avankest 657: <ol>
1.203 avankest 658: <li>
659: <p>If the <code>XMLHttpRequest</code> object has an associated
660: <span><code>XMLHttpRequest</code> <code>Document</code></span> run
661: these substeps:</p>
1.90 avankest 662:
1.203 avankest 663: <ol>
664: <li><p>If the
665: <span><code>XMLHttpRequest</code> <code>Document</code></span> is not
666: <span>fully active</span> raise an <code>INVALID_STATE_ERR</code>
667: exception and terminate the overall set of steps.</p></li>
668:
669: <li><p>Let <span><code>XMLHttpRequest</code> base URL</span> be the
670: <span>document base URL</span> of the
671: <span><code>XMLHttpRequest</code> <code>Document</code></span>.</p></li>
672:
673: <li><p>Let <span><code>XMLHttpRequest</code> origin</span> be the
674: <span>origin</span> of the
675: <span><code>XMLHttpRequest</code> <code>Document</code></span>.</p></li>
676: </ol>
677: </li>
1.90 avankest 678:
1.256 avankest 679: <li><p>If any code point in <var>method</var> is higher than
680: U+00FF LATIN SMALL LETTER Y WITH DIAERESIS or after
1.294 avankest 681: <span title="deflate a DOMString into a byte sequence">deflating</span>
1.256 avankest 682: <var>method</var> it does not match the
1.210 avankest 683: <span>Method token</span> production raise a <code>SYNTAX_ERR</code>
1.256 avankest 684: exception and terminate these steps. Otherwise let <var>method</var> be
685: the result of
1.294 avankest 686: <span title="deflate a DOMString into a byte sequence">deflating</span>
1.256 avankest 687: <var>method</var>.</p></li> <!-- This sounds lame, but it works. -->
1.118 avankest 688:
1.115 avankest 689: <li>
1.256 avankest 690: <p>If <var>method</var> is a case-insensitive match for
1.203 avankest 691: <code>CONNECT</code>, <code>DELETE</code>, <code>GET</code>,
692: <code>HEAD</code>, <code>OPTIONS</code>, <code>POST</code>,
693: <code>PUT</code>, <code>TRACE</code>, or <code>TRACK</code>
1.256 avankest 694: subtract 0x20 from each byte in the range 0x61 (ASCII a) to
695: 0x7A (ASCII z).</p>
1.118 avankest 696:
1.203 avankest 697: <p class="note">If it does not match any of the above, it is passed
698: through <em>literally</em>, including in the final request.</p>
1.115 avankest 699: </li>
1.203 avankest 700: <!-- WebKit (and supposedly Gecko) also uppercase: COPY, INDEX, LOCK,
701: M-POST, MKCOL, MOVE, PROPFIND, PROPPATCH, and UNLOCK. -->
1.118 avankest 702:
1.111 avankest 703: <li>
1.256 avankest 704: <p>If <var>method</var> is a case-sensitive match for
1.259 avankest 705: <code>CONNECT</code>, <code>TRACE</code>, or <code>TRACK</code> raise a
706: <code>SECURITY_ERR</code> exception and terminate these steps.</p>
1.117 avankest 707:
1.203 avankest 708: <p class="note">Allowing these methods poses a security risk.
709: [<cite><span>HTTPVERBSEC</span></cite>]</p>
1.111 avankest 710: </li>
711:
1.203 avankest 712: <li><p>Let <var title="">url</var> be a <span>URL</span>.</p></li>
713:
1.209 avankest 714: <li><p>Let <span>URL character encoding</span> of <var title="">url</var>
715: be UTF-8.</p></li>
1.113 avankest 716:
1.255 avankest 717: <li><p><span title="Resolve a URL">Resolve</span> <var title="">url</var>
1.203 avankest 718: relative to the <span><code>XMLHttpRequest</code> base URL</span>.
719: If the algorithm returns an error raise a <code>SYNTAX_ERR</code>
720: exception and terminate these steps.</p></li>
721:
722: <!-- Presto and Gecko override the encoding. WebKit does not. Trident
723: does not support non-ASCII URLs. This matters for the <query> component,
724: see HTML5. -->
725:
726: <li><p>Drop <code><fragment></code> from <var title="">url</var>.</p></li>
727:
728: <li><p>If the <code>"user:password"</code> format in the
1.301 avankest 729: <code>userinfo</code> production is not supported for the relevant
730: <code><scheme></code> and <var title="">url</var> contains this format
731: raise a <code>SYNTAX_ERR</code> and terminate these steps.</p></li>
1.203 avankest 732:
1.310 avankest 733: <!-- XXX need to throw here for "user:password" or just "user" for
734: cross-origin unless we solve this in another way -->
735:
1.203 avankest 736: <li><p>If <var title="">url</var> contains the <code>"user:password"</code>
737: format let <var>temp user</var> be the user part and
738: <var>temp password</var> be the password part.</p></li>
739:
740: <li><p>If <var title="">url</var> just contains the <code>"user"</code>
741: format let <var>temp user</var> be the user part.</p></li>
742:
1.211 avankest 743: <li><p>Let <var>async</var> be the value of the <var>async</var> argument
1.266 avankest 744: or true if it was omitted.</p></li>
1.203 avankest 745:
746: <li>
1.300 avankest 747: <p>If the <var title="">user</var> argument was not omitted follow these
748: sub steps:</p>
1.90 avankest 749:
1.203 avankest 750: <ol>
1.300 avankest 751: <li><p>If <var title="">user</var> is not null and the
752: <span>origin</span> of <var title="">url</var> is not
753: <span>same origin</span> with the
754: <span><code>XMLHttpRequest</code> origin</span> raise an
755: <code>INVALID_ACCESS_ERR</code> exception and terminate the overall set
756: of steps.</p></li>
1.263 avankest 757:
1.300 avankest 758: <li><p>Let <var>temp user</var> be <var>user</var>.</p></li>
1.203 avankest 759: </ol>
1.88 avankest 760:
1.203 avankest 761: <p class="note">These steps override anything that may have been set by
762: the <var title="">url</var> argument.</p>
763: </li>
1.88 avankest 764:
1.128 avankest 765: <li>
1.300 avankest 766: <p>If the <var title="">password</var> argument was not omitted follow
767: these sub steps:</p>
1.203 avankest 768:
769: <ol>
1.300 avankest 770: <li><p>If <var title="">password</var> is not null and the
771: <span>origin</span> of <var title="">url</var> is not
772: <span>same origin</span> with the
773: <span><code>XMLHttpRequest</code> origin</span> raise an
774: <code>INVALID_ACCESS_ERR</code> exception and terminate the overall set
775: of steps.</p></li>
1.263 avankest 776:
1.300 avankest 777: <li><p>Let <var>temp password</var> be <var>password</var>.</p></li>
1.203 avankest 778: </ol>
779:
780: <p class="note">These steps override anything that may have been set by
781: the <var title="">url</var> argument.</p>
1.128 avankest 782: </li>
1.88 avankest 783:
1.314 avankest 784: <li><p><span title="terminate abort()">Terminate the <code>abort()</code> algorithm</span>.</p></li>
785:
786: <li><p><span title="terminate send()">Terminate the <code>send()</code> algorithm</span>.</p></li>
1.203 avankest 787:
788: <li><p>The user agent <em class="ct">should</em> cancel any network
789: activity for which the object is responsible.</p></li>
790: <!-- we can hardly require it... -->
791:
1.252 avankest 792: <li><p>If there are any <span title="task">tasks</span> from the object's
793: <span><code>XMLHttpRequest</code> task source</span> in one of the
794: <span>task queues</span>, then remove those tasks.</p></li>
795:
1.203 avankest 796: <li>
797: <p>Set variables associated with the object as follows:</p>
798:
799: <ul>
800:
801: <li><p>Set the <span>request method</span> to <var>method</var>.</p></li>
802:
803: <li><p>Set the <span>request URL</span> to <var title="">url</var>.</p></li>
1.58 avankest 804:
1.303 avankest 805: <li><p>Set the <span>asynchronous flag</span> to the value of
806: <var>async</var>.</p></li>
807:
1.203 avankest 808: <li><p>Set the <span>request username</span> to <var>temp user</var>.</p></li>
1.12 avankest 809:
1.203 avankest 810: <li><p>Set the <span>request password</span> to <var>temp password</var>.</p></li>
1.12 avankest 811:
1.303 avankest 812: <li><p>Empty the list of <span>author request headers</span>.</p>
813:
1.304 avankest 814:
815:
1.303 avankest 816: <li><p>Set the <span><code>send()</code> flag</span> to false.</p></li>
817:
818: <li><p>Set <span>response entity body</span> to null.</p></li>
1.203 avankest 819: </ul>
820: </li>
1.58 avankest 821:
1.308 avankest 822: <li><p>Switch the state to
1.272 avankest 823: <span title="dom-XMLHttpRequest-OPENED">OPENED</span>.</p></li>
1.58 avankest 824:
1.203 avankest 825: <li><p><span>Dispatch a <code>readystatechange</code> event</span>.</p></li>
826: </ol>
1.280 avankest 827:
1.58 avankest 828:
1.14 avankest 829:
1.203 avankest 830: <h4>The <code title="">setRequestHeader()</code> method</h4>
1.12 avankest 831:
1.270 avankest 832: <dl class="domintro">
1.279 avankest 833: <dt><var title="">client</var> . <code title="dom-XMLHttpRequest-setRequestHeader">setRequestHeader(<var title="">header</var>, <var title="">value</var>)</code></dt>
1.280 avankest 834:
1.270 avankest 835: <dd>
836: <p>Appends an header to the list of
1.310 avankest 837: <span>author request headers</span>, or if <var>header</var> is already
838: in the list of <span>author request headers</span>, combines its value
839: with <var>value</var>.</p>
1.280 avankest 840:
841: <p>Throws an <code>INVALID_STATE_ERR</code> exception if the state is
842: not <span title="dom-XMLHttpRequest-OPENED">OPENED</span> or if the
843: <span><code>send()</code> flag</span> is true.</p>
844:
845: <p>Throws a <code>SYNTAX_ERR</code> exception if
846: <var title="">header</var> is not a valid HTTP header field name or if
847: <var title="">value</var> is not a valid HTTP header field value.</p>
1.270 avankest 848: </dd>
849: </dl>
1.45 avankest 850:
1.279 avankest 851: <p class="note">As indicated in the algorithm below certain headers cannot
852: be set and are left up to the user agent. In addition there are certain
853: other headers the user agent will take control of if they are not set by
854: the author as indicated at the end of the
1.271 avankest 855: <code title="dom-XMLHttpRequest-send">send()</code> method section.</p>
1.203 avankest 856:
1.248 avankest 857:
858:
1.203 avankest 859: <p>When the
1.279 avankest 860: <dfn id="dom-xmlhttprequest-setrequestheader" title="dom-XMLHttpRequest-setRequestHeader"><code>setRequestHeader(<var title="">header</var>, <var title="">value</var>)</code></dfn>
861: method is invoked, the user agent <em class="ct">must</em> run these
862: steps:</p>
1.14 avankest 863:
1.203 avankest 864: <ol>
1.272 avankest 865: <li><p>If the state is not <span title="dom-XMLHttpRequest-OPENED">OPENED</span> raise
1.203 avankest 866: an <code>INVALID_STATE_ERR</code> exception and terminate these
867: steps.</p></li>
868:
869: <li><p>If the <span><code>send()</code> flag</span> is true raise an
870: <code>INVALID_STATE_ERR</code> exception and terminate these
871: steps.</p></li>
872:
1.256 avankest 873: <li><p>If any code point in <var>header</var> is higher than
874: U+00FF LATIN SMALL LETTER Y WITH DIAERESIS or after
1.294 avankest 875: <span title="deflate a DOMString into a byte sequence">deflating</span>
1.256 avankest 876: <var>header</var> it does not match the
877: <span>field-name</span> production raise a <code>SYNTAX_ERR</code>
878: exception and terminate these steps. Otherwise let <var>header</var> be
879: the result of
1.294 avankest 880: <span title="deflate a DOMString into a byte sequence">deflating</span>
1.256 avankest 881: <var>header</var>.</p></li> <!-- This sounds lame, but it works. -->
1.203 avankest 882:
883: <li>
1.256 avankest 884: <p>If any code point in <var>value</var> is higher than
885: U+00FF LATIN SMALL LETTER Y WITH DIAERESIS or after
1.294 avankest 886: <span title="deflate a DOMString into a byte sequence">deflating</span>
1.256 avankest 887: <var>value</var> it does not match the
888: <span>field-value</span> production raise a <code>SYNTAX_ERR</code>
889: exception and terminate these steps. Otherwise let <var>value</var> be
890: the result of
1.294 avankest 891: <span title="deflate a DOMString into a byte sequence">deflating</span>
1.256 avankest 892: <var>value</var>.</p> <!-- This sounds lame, but it works. -->
1.203 avankest 893:
894: <p class="note">The empty string is legal and represents the empty
895: header value.</p>
896: </li>
897:
898: <li>
1.259 avankest 899: <p>Terminate these steps if <var>header</var> is a case-insensitive
900: match for one of the following headers:</p>
1.203 avankest 901:
902: <ul>
903: <li><code>Accept-Charset</code></li>
904: <li><code>Accept-Encoding</code></li>
905: <li><code>Connection</code></li>
906: <li><code>Content-Length</code></li>
907: <li><code>Cookie</code></li>
908: <li><code>Cookie2</code></li>
909: <li><code>Content-Transfer-Encoding</code></li>
910: <li><code>Date</code></li>
911: <li><code>Expect</code></li>
912: <li><code>Host</code></li>
913: <li><code>Keep-Alive</code></li>
914: <li><code>Referer</code></li>
915: <li><code>TE</code></li>
916: <li><code>Trailer</code></li>
917: <li><code>Transfer-Encoding</code></li>
918: <li><code>Upgrade</code></li>
919: <li><code>User-Agent</code></li>
920: <li><code>Via</code></li>
921: </ul>
1.96 avankest 922:
1.256 avankest 923: <p>… or if the start of <var>header</var> is a case-insensitive
924: match for <code>Proxy-</code> or <code>Sec-</code> (including when
925: <var>header</var> is just <code>Proxy-</code> or <code>Sec-</code>).</p>
1.203 avankest 926:
1.280 avankest 927: <p class="note">The above headers are controlled by the user agent to
928: let it control those aspects of transport. This guarantees data
929: integrity to some extent. Header names starting with <code>Sec-</code>
930: are not allowed to be set to allow new headers to be minted that are
931: guaranteed not to come from <code>XMLHttpRequest</code>.</p>
1.203 avankest 932: </li>
1.14 avankest 933:
1.203 avankest 934: <li><p>If <var>header</var> is not in the
935: <span>author request headers</span> list append <var>header</var> with
936: its associated <var>value</var> to the list and terminate these
937: steps.</p></li>
938:
939: <li><p>If <var>header</var> is in the <span>author request headers</span>
940: list either use multiple headers, combine the values or use a combination
941: of those (section 4.2, RFC 2616).
942: [<cite><span>RFC2616</span></cite>]</p></li>
943: <!-- XXX it seems UAs always combine the values -->
944: </ol>
1.45 avankest 945:
1.271 avankest 946: <p class="note">See also the
947: <code title="dom-XMLHttpRequest-send">send()</code> method regarding user
1.203 avankest 948: agent header handling for caching, authentication, proxies, and
949: cookies.</p>
1.14 avankest 950:
1.203 avankest 951: <div class="example">
1.312 avankest 952: <p>Some simple code demonstrating what happens when setting the same
953: header twice:</p>
954:
1.203 avankest 955: <pre><code>// The following script:
1.14 avankest 956: var client = new XMLHttpRequest();
957: client.open('GET', 'demo.cgi');
958: client.setRequestHeader('X-Test', 'one');
959: client.setRequestHeader('X-Test', 'two');
960: client.send();
961:
1.312 avankest 962: // …results in the following header being sent:
963: X-Test: one, two</code></pre>
1.203 avankest 964: </div>
1.255 avankest 965:
1.248 avankest 966:
1.218 avankest 967:
1.203 avankest 968:
969: <h4>The <code title="">send()</code> method</h4>
1.12 avankest 970:
1.271 avankest 971: <dl class="domintro">
972: <dt><var title="">client</var> . <code title="dom-XMLHttpRequest-send">send(<var title="">data</var>)</code></dt>
1.280 avankest 973: <dd>
974: <p>Initiates the request. The optional argument provides the
975: <span>request entity body</span>. The argument is ignored if
976: <span>request method</span> is <code>GET</code> or
977: <code>HEAD</code>.</p>
978:
979: <p>Throws an <code>INVALID_STATE_ERR</code> exception if the state is
980: not <span title="dom-XMLHttpRequest-OPENED">OPENED</span> or if the
981: <span><code>send()</code> flag</span> is true.</p>
982: </dd>
1.271 avankest 983: </dl>
1.203 avankest 984:
985: <p>When the
1.271 avankest 986: <dfn id="dom-xmlhttprequest-send" title="dom-XMLHttpRequest-send"><code>send(<var>data</var>)</code></dfn>
1.314 avankest 987: method is invoked, the user agent <em class="ct">must</em> run these steps
988: (unless otherwise noted). This algorithm can be
989: <dfn title="terminate send()">terminated</dfn> by invoking the
990: <code title="dom-XMLHttpRequest-open">open()</code> or
991: <code title="dom-XMLHttpRequest-abort">abort()</code> method. When it is
992: <span title="terminate send()">terminated</span> the user agent
993: <em class="ct">must</em> terminate the algorithm after finishing the step
994: it is on.</p>
995:
996: <p class="note">The <code title="dom-XMLHttpRequest-send">send()</code>
997: algorithm can only be terminated when the <span>asynchronous flag</span>
998: is true and only after the method call has returned.</p>
1.181 avankest 999:
1.203 avankest 1000: <ol>
1.272 avankest 1001: <li><p>If the state is not <span title="dom-XMLHttpRequest-OPENED">OPENED</span> raise
1.203 avankest 1002: an <code>INVALID_STATE_ERR</code> exception and terminate these
1003: steps.</p></li>
1004:
1005: <li><p>If the <span><code>send()</code> flag</span> is true raise an
1006: <code>INVALID_STATE_ERR</code> exception and terminate these
1007: steps.</p></li>
1.58 avankest 1008:
1.203 avankest 1009: <li>
1.280 avankest 1010: <p>If the <span>request method</span> is a case-sensitive match for
1011: <code>GET</code> or <code>HEAD</code> act as if <var title="">data</var>
1012: is null.</p>
1.295 avankest 1013:
1.232 avankest 1014: <p>If the <var>data</var> argument has been omitted or is
1.239 avankest 1015: null, do not include a <span>request entity body</span>
1.232 avankest 1016: and go to the next step.</p>
1.248 avankest 1017:
1018: <p>Otherwise, let <var>encoding</var> be null, <var>mime type</var> be
1019: null, and then follow these rules:</p>
1.203 avankest 1020:
1021: <dl class="switch">
1.248 avankest 1022:
1.295 avankest 1023:
1.248 avankest 1024: <dt>If <var>data</var> is a <code>Document</code>
1.203 avankest 1025:
1026: <dd>
1.232 avankest 1027: <p>Let <var>encoding</var> be the <span>preferred MIME name</span> of
1028: the
1029: <span title="document's character encoding">character encoding</span>
1030: of <var>data</var>. If <var>encoding</var> is UTF-16 change it to
1031: UTF-8.</p>
1.295 avankest 1032:
1.302 avankest 1033: <p>Let <var>mime type</var> be "<code>application/xml</code>" or
1034: "<code>text/html</code>" if <code>Document</code> is flagged as
1035: <span title="HTML documents">HTML document</span>, followed by
1036: "<code>;charset=</code>", followed by <var>encoding</var>.</p>
1.232 avankest 1037:
1038: <p>Let the <span>request entity body</span> be the result of getting
1039: the <code title="dom-innerHTML">innerHTML</code> attribute on
1.233 avankest 1040: <var>data</var>
1041: <span title="convert a DOMString to a sequence of Unicode characters">converted to Unicode</span>
1042: and encoded as <var>encoding</var>. Re-raise any exception this
1043: raises.</p>
1.218 avankest 1044:
1.233 avankest 1045: <p class="note">In particular, if the document cannot be serialized an
1.217 avankest 1046: <code>INVALID_STATE_ERR</code> exception is raised.</p>
1047:
1.203 avankest 1048: <p class="note">Subsequent changes to the <code>Document</code> have
1049: no effect on what is submitted.</p>
1050: </dd>
1.237 avankest 1051:
1.248 avankest 1052: <dt>If <var>data</var> is a <code>DOMString</code></dt>
1.237 avankest 1053:
1.248 avankest 1054: <dd>
1055: <p>Let <var>encoding</var> be UTF-8.</p>
1.295 avankest 1056:
1.248 avankest 1057: <p>Let <var>mime type</var> be "<code>text/plain;charset=UTF-8</code>".</p>
1058:
1059: <p>Let the <span>request entity body</span> be <var>data</var>
1060: <span title="convert a DOMString to a sequence of Unicode characters">converted to Unicode</span>
1061: and encoded as UTF-8.</p>
1062: </dd>
1063:
1064:
1.203 avankest 1065: </dl>
1.58 avankest 1066:
1.232 avankest 1067: <p>If a <code>Content-Type</code> header is set using
1.279 avankest 1068: <code title="dom-XMLHttpRequest-setRequestHeader">setRequestHeader()</code>
1069: whose value is a <span>valid MIME type</span> and has a
1070: <code>charset</code> parameter whose value is not a case-insensitive
1071: match for <var title="">encoding</var>, and <var title="">encoding</var>
1072: is not null, set all the <code>charset</code> parameters of the
1073: <code>Content-Type</code> header to <var title="">encoding</var>.</p>
1.232 avankest 1074:
1075: <p>If no <code>Content-Type</code> header has been set using
1.279 avankest 1076: <code title="dom-XMLHttpRequest-setRequestHeader">setRequestHeader()</code>
1077: and <var title="">mime type</var> is not null set a
1078: <code>Content-Type</code> request header with as value
1079: <var title="">mime type</var>.</p>
1.236 avankest 1080:
1081: <!-- reminder: if we ever change this to always include charset it has
1082: to be included as the first parameter for compatibility reasons -->
1.203 avankest 1083: </li>
1.202 avankest 1084:
1.203 avankest 1085: <li><p>If the <span>asynchronous flag</span> is false release the
1086: <span>storage mutex</span>.</p></li>
1.103 avankest 1087:
1.248 avankest 1088:
1089:
1.203 avankest 1090: <li><p>Set the <span>error flag</span> to false.</p></li>
1.218 avankest 1091:
1.248 avankest 1092:
1093:
1.211 avankest 1094: <li>
1095: <p>If the <span>asynchronous flag</span> is true run these substeps:</p>
1.218 avankest 1096:
1.211 avankest 1097: <ol>
1.217 avankest 1098: <li><p>Set the <span><code>send()</code> flag</span> to true.</p></li>
1099:
1.211 avankest 1100: <li>
1101: <p><span>Dispatch a <code>readystatechange</code> event</span>.</p>
1.145 avankest 1102:
1.211 avankest 1103: <p class="note">The state does not change. The event is dispatched for
1104: historical reasons.</p>
1105: </li>
1106:
1.248 avankest 1107:
1108:
1.271 avankest 1109: <li><p>Return the <code title="dom-XMLHttpRequest-send">send()</code>
1110: method call, but continue running the steps in this algorithm.</p></li>
1.211 avankest 1111: </ol>
1112: </li>
1.218 avankest 1113:
1.203 avankest 1114: <li>
1.300 avankest 1115: <dl class="switch">
1116: <dt>If the <span><code>XMLHttpRequest</code> origin</span> and the
1117: <span>request URL</span> are <span>same origin</span></dt>
1118:
1119: <dd>
1120: <p>These are the <dfn>same-origin request steps</dfn>.</p>
1.211 avankest 1121:
1.261 avankest 1122: <p><span>Fetch</span> the <span>request URL</span> from
1.260 avankest 1123: <i title="">origin</i>
1124: <span><code>XMLHttpRequest</code> origin</span>, with the
1125: <i title="">synchronous flag</i> set if the
1126: <span>asynchronous flag</span> is false, using HTTP method
1.248 avankest 1127: <span>request method</span>, user <span>request username</span> (if
1128: non-null) and password <span>request password</span> (if non-null),
1129: taking into account the <span>request entity body</span>, list of
1130: <span>author request headers</span> and the rules listed at the end of
1131: this section.</p>
1132:
1133: <dl class="switch">
1134: <dt>If the <span>asynchronous flag</span> is false</dt>
1135: <dd>
1136: <p>While making the request also follow the
1137: <span>same-origin request event rules</span>.</p>
1138:
1139: <!--
1140: This cannot involve any task queue whatsoever because that would
1141: mean other tasks on the task queue might get processed as well
1142: which is counter to the whole idea of doing things synchronous.
1143: -->
1144:
1.271 avankest 1145: <p class="note">The
1146: <code title="dom-XMLHttpRequest-send">send()</code> method call will
1147: now be returned by virtue of this algorithm ending.</p>
1.248 avankest 1148: </dd>
1149:
1150: <dt>If the <span>asynchronous flag</span> is true</dt>
1151: <dd>
1.300 avankest 1152:
1.248 avankest 1153:
1154: <p>While processing the request, as data becomes available and when
1155: the user interferes with the request,
1.255 avankest 1156: <span title="queue a task">queue tasks</span> to update the
1157: <span>response entity body</span> and follow the
1.254 avankest 1158: <span>same-origin request event rules</span>.</p>
1.248 avankest 1159: </dd>
1160: </dl>
1.300 avankest 1161: </dd>
1162:
1163: <dt>Otherwise</dt>
1164: <dd>
1165: <p>These are the <dfn>cross-origin request steps</dfn>.</p>
1166:
1167:
1168: <p>This is a <span>network error</span>.</p>
1169:
1170:
1171:
1172: </dd>
1173: </dl>
1.203 avankest 1174: </li>
1175: </ol>
1.60 avankest 1176:
1.203 avankest 1177: <hr>
1178:
1.227 avankest 1179: <p>If the user agent allows the end user to configure a proxy it
1.248 avankest 1180: <em class="ct">should</em> modify the request appropriately; i.e., connect
1181: to the proxy host instead of the origin server, modify the
1182: <code>Request-Line</code> and send <code>Proxy-Authorization</code>
1183: headers as specified.</p>
1.295 avankest 1184:
1.262 avankest 1185: <hr>
1.212 avankest 1186:
1.218 avankest 1187: <p>If the user agent supports HTTP Authentication and
1.262 avankest 1188: <code title="http-authorization">Authorization</code> is not in the list
1189: of <span>author request headers</span>, it <em class="ct">should</em>
1.218 avankest 1190: consider requests originating from the <code>XMLHttpRequest</code> object
1191: to be part of the protection space that includes the accessed URIs and
1.262 avankest 1192: send <code title="http-authorization">Authorization</code> headers and
1193: handle <code>401 Unauthorized</code> requests appropriately.</p>
1194:
1195: <p>If authentication fails,
1.311 avankest 1196: <span><code>XMLHttpRequest</code> origin</span> and the
1197: <span>request URL</span> are <span>same origin</span>,
1.262 avankest 1198: <code title="http-authorization">Authorization</code> is not in the list
1199: of <span>author request headers</span>, <span>request username</span> is
1200: null, and <span>request password</span> is null, user agents
1201: <em class="ct">should</em> prompt the end user for their username and
1202: password.</p>
1.295 avankest 1203:
1.311 avankest 1204: <p>Otherwise, if authentication fails, user agents
1.262 avankest 1205: <em class="ct">must not</em> prompt the end user for their username and
1206: password. [<cite><span>RFC2617</span></cite>]</p>
1.212 avankest 1207:
1.311 avankest 1208: <p class="note">End users are not prompted for various cases so that
1209: authors can implement their own user interface.</p>
1.295 avankest 1210:
1.262 avankest 1211: <hr>
1.212 avankest 1212:
1213: <p>If the user agent supports HTTP State Management it
1214: <em class="ct">should</em> persist, discard and send cookies (as received
1.297 avankest 1215: in the <code>Set-Cookie</code> response header, and sent in the
1216: <code>Cookie</code> header) as applicable.
1.212 avankest 1217: [<cite><span>COOKIES</span></cite>]</p>
1.295 avankest 1218:
1.262 avankest 1219: <hr>
1.212 avankest 1220:
1221: <p>If the user agent implements a HTTP cache it <em class="ct">should</em>
1.248 avankest 1222: respect <code>Cache-Control</code> request headers set by the
1.279 avankest 1223: <code title="dom-XMLHttpRequest-setRequestHeader">setRequestHeader()</code>
1224: (e.g., <code>Cache-Control: no-cache</code> bypasses the cache). It
1225: <em class="ct">must not</em> send <code>Cache-Control</code> or
1226: <code>Pragma</code> request headers automatically unless the end user
1227: explicitly requests such behavior (e.g. by reloading the page).</p>
1.212 avankest 1228:
1229: <p>For <code>304 Not Modified</code> responses that are a result of a
1230: user agent generated conditional request the user agent
1231: <em class="ct">must</em> act as if the server gave a <code>200 OK</code>
1232: response with the appropriate content. The user agent
1.279 avankest 1233: <em class="ct">must</em> allow
1234: <code title="dom-XMLHttpRequest-setRequestHeader">setRequestHeader()</code>
1235: to override automatic cache validation by setting request headers (e.g.
1.248 avankest 1236: <code>If-None-Match</code> or <code>If-Modified-Since</code>), in which
1.212 avankest 1237: case <code>304 Not Modified</code> responses <em class="ct">must</em> be
1238: passed through. [<cite><span>RFC2616</span></cite>]</p>
1.295 avankest 1239:
1.262 avankest 1240: <hr>
1.212 avankest 1241:
1242: <p>If the user agent implements server-driven content-negotiation
1.298 avankest 1243: it <em class="ct">must</em> follow these constraints for the
1244: <code>Accept</code> and <code>Accept-Language</code> request headers:</p>
1.231 avankest 1245:
1246: <ul>
1247: <li><p>Both headers <em class="ct">must not</em> be modified if they are
1.279 avankest 1248: already set through
1249: <code title="dom-XMLHttpRequest-setRequestHeader">setRequestHeader()</code>.</p></li>
1.255 avankest 1250:
1.279 avankest 1251: <li><p>If not set through
1252: <code title="dom-XMLHttpRequest-setRequestHeader">setRequestHeader()</code>
1.255 avankest 1253: <code>Accept-Language</code> <em class="ct">should</em> be set as
1.231 avankest 1254: appropriate.</p></li>
1255:
1.279 avankest 1256: <li><p>If not set through
1257: <code title="dom-XMLHttpRequest-setRequestHeader">setRequestHeader()</code>
1.231 avankest 1258: <code>Accept</code> <em class="ct">must</em> be set with as value
1259: <code>*/*</code>.</p></li>
1260: </ul>
1261:
1262: <p>Responses <em class="ct">must</em> have the content-encodings
1263: automatically decoded. [<cite><span>RFC2616</span></cite>]</p>
1.212 avankest 1264:
1.262 avankest 1265: <hr>
1266:
1.212 avankest 1267: <p>Besides the <span>author request headers</span> user agents
1268: <em class="ct">should not</em> include additional request headers other
1.248 avankest 1269: than those mentioned above or other than those authors are not allowed to
1.279 avankest 1270: set using
1271: <code title="dom-XMLHttpRequest-setRequestHeader">setRequestHeader()</code>.
1272: This ensures that authors have a reasonably predictable API.</p>
1.218 avankest 1273:
1.212 avankest 1274:
1275: <h4>Infrastructure for the <code title="">send()</code> method</h4>
1.216 avankest 1276:
1.219 avankest 1277: <p>The <dfn>same-origin request event rules</dfn> are as follows:</p>
1.118 avankest 1278:
1.203 avankest 1279: <dl class="switch">
1.316 avankest 1280: <dt>If the response has an HTTP status code of 301, 302, 303, or 307</dt>
1.203 avankest 1281: <dd>
1.300 avankest 1282: <p>If the redirect violates infinite loop precautions this is a
1283: <span>network error</span>.</p>
1284:
1285: <p>Otherwise, run these steps:</p>
1286:
1287: <ol>
1288: <li><p>Set the <span>request URL</span> to the <span>URL</span>
1289: conveyed by the <code>Location</code> header.</p></li>
1290:
1291: <li><p>If the <span><code>XMLHttpRequest</code> origin</span> and the
1292: <span>origin</span> of <span>request URL</span> are
1293: <span>same origin</span> transparently follow the redirect while
1294: observing the <span>same-origin request event rules</span>.</p></li>
1.295 avankest 1295:
1.300 avankest 1296: <li><p>Otherwise, follow the <span>cross-origin request steps</span>
1297: and terminate the steps for this algorithm.</p></li>
1298: </ol>
1.203 avankest 1299:
1300: <p class="note">HTTP places requirements on the user agent regarding the
1.204 avankest 1301: preservation of the <span>request method</span> and
1.248 avankest 1302: <span>request entity body</span> during redirects, and also requires end
1303: users to be notified of certain kinds of automatic redirections.</p>
1.203 avankest 1304: <!-- XXX HTTP needs fixing here -->
1.213 avankest 1305: </dd>
1.121 avankest 1306:
1.285 avankest 1307: <dt>If the end user cancels the request</dt>
1.213 avankest 1308: <dd><p>This is an <span>abort error</span>.</p></dd>
1.60 avankest 1309:
1.285 avankest 1310: <dt>If there is a network error</dt>
1.213 avankest 1311: <dd>
1312: <p>In case of DNS errors, TLS negotiation failure, or other type of
1313: network errors, this is a <span>network error</span>. Do not request any
1.227 avankest 1314: kind of end user interaction.</p>
1.121 avankest 1315:
1.213 avankest 1316: <p class="note">This does not include HTTP responses that indicate
1317: some type of error, such as HTTP status code 410.</p>
1318: </dd>
1.60 avankest 1319:
1.248 avankest 1320:
1321:
1.306 avankest 1322: <dt>Once all HTTP headers have been received, the
1.316 avankest 1323: <span>asynchronous flag</span> is true, and the HTTP status code of the
1324: response is not 301, 302, 303, or 307</dt>
1.284 avankest 1325: <dd><p><span>Switch to the HEADERS_RECEIVED state</span>.</p></dd>
1.186 avankest 1326:
1.220 avankest 1327: <dt>Once the first byte (or more) of the
1328: <span>response entity body</span> has been received and the
1329: <span>asynchronous flag</span> is true</dt>
1330: <dt>If there is no <span>response entity body</span> and the
1.213 avankest 1331: <span>asynchronous flag</span> is true</dt>
1.284 avankest 1332: <dd><p><span>Switch to the LOADING state</span>.</p></dd>
1.295 avankest 1333:
1.220 avankest 1334: <dt>Once the whole <span>response entity body</span> has been
1335: received</dt>
1.296 avankest 1336: <dt>If there is no <span>response entity body</span> and the state is
1337: <span title="dom-XMLHttpRequest-LOADING">LOADING</span></dt>
1.224 avankest 1338: <dt>If there is no <span>response entity body</span> and the
1.296 avankest 1339: <span>asynchronous flag</span> is false</dt>
1.284 avankest 1340: <dd><p><span>Switch to the DONE state</span>.</p></dd>
1.213 avankest 1341: </dl>
1.218 avankest 1342:
1.248 avankest 1343:
1344:
1.213 avankest 1345: <hr>
1.218 avankest 1346:
1.241 avankest 1347: <p>When something is said to be a <dfn>network error</dfn> run the
1348: <span>request error</span> steps for exception
1349: <code>NETWORK_ERR</code>.</p>
1350:
1351: <p>When something is said to be an <dfn>abort error</dfn> run the
1352: <span>request error</span> steps for exception
1353: <code>ABORT_ERR</code>.</p>
1.60 avankest 1354:
1.248 avankest 1355:
1356:
1.242 avankest 1357: <p>When something is said to be a <dfn>request error</dfn> for
1.248 avankest 1358: exception <var>exception</var> run these
1359: steps:</p>
1.12 avankest 1360:
1.213 avankest 1361: <ol>
1.254 avankest 1362: <li><p>The user agent <em class="ct">should</em> cancel any network
1363: activity for which the object is responsible.</p></li>
1364:
1365: <li><p>If there are any <span title="task">tasks</span> from the object's
1366: <span><code>XMLHttpRequest</code> task source</span> in one of the
1367: <span>task queues</span>, then remove those tasks.</p></li>
1.250 avankest 1368:
1.213 avankest 1369: <li><p>Set the the <span>error flag</span> to true.</p></li>
1.12 avankest 1370:
1.272 avankest 1371: <li><p>Switch the state to <span title="dom-XMLHttpRequest-DONE">DONE</span>.</p></li>
1.203 avankest 1372:
1.241 avankest 1373: <li><p>If the <span>asynchronous flag</span> is false raise an
1374: <var>exception</var> exception and terminate the overall set of
1.213 avankest 1375: steps.</p></li>
1.203 avankest 1376:
1.248 avankest 1377: <li>
1.249 avankest 1378: <p><span>Dispatch a <code>readystatechange</code> event</span>.</p>
1.248 avankest 1379:
1380: <p class="note">At this point it is clear that the
1381: <span>asynchronous flag</span> is true.</p>
1382: </li>
1383:
1384:
1.213 avankest 1385: </ol>
1.203 avankest 1386:
1.248 avankest 1387:
1388: <p class="note">A future version of this specification will dispatch an
1.273 avankest 1389: <code title="event-xhr-error">error</code>/<code>abort</code> event here as well. (Depending on
1.248 avankest 1390: the type of error.)</p>
1391:
1.203 avankest 1392:
1.213 avankest 1393: <hr>
1.203 avankest 1394:
1.213 avankest 1395: <p>When it is said to
1.284 avankest 1396: <dfn id="switch-headers-received">switch to the HEADERS_RECEIVED state</dfn>
1.213 avankest 1397: run these steps:</p>
1.203 avankest 1398:
1.213 avankest 1399: <ol>
1.272 avankest 1400: <li><p>Switch the state to <span title="dom-XMLHttpRequest-HEADERS_RECEIVED">HEADERS_RECEIVED</span>.</p></li>
1.203 avankest 1401:
1.249 avankest 1402: <li><p><span>Dispatch a <code>readystatechange</code> event</span>.</p></li>
1.213 avankest 1403: </ol>
1.218 avankest 1404:
1.213 avankest 1405: <p>When it is said to
1.284 avankest 1406: <dfn id="switch-loading">switch to the LOADING state</dfn> run these
1.213 avankest 1407: steps:</p>
1.218 avankest 1408:
1.213 avankest 1409: <ol>
1.272 avankest 1410: <li><p>Switch the state to <span title="dom-XMLHttpRequest-LOADING">LOADING</span>.</p></li>
1.203 avankest 1411:
1.249 avankest 1412: <li><p><span>Dispatch a <code>readystatechange</code> event</span>.</p></li>
1.213 avankest 1413: </ol>
1.218 avankest 1414:
1.216 avankest 1415: <p>When it is said to
1.284 avankest 1416: <dfn id="switch-done">switch to the DONE state</dfn> run these steps:</p>
1.218 avankest 1417:
1.216 avankest 1418: <ol>
1.255 avankest 1419: <li><p>If the <span>asynchronous flag</span> is false update the
1420: <span>response entity body</span>.</p></li>
1421:
1.272 avankest 1422: <li><p>Switch the state to <span title="dom-XMLHttpRequest-DONE">DONE</span>.</p></li>
1.216 avankest 1423:
1.248 avankest 1424: <li><p><span>Dispatch a <code>readystatechange</code> event</span>.</p></li>
1425:
1.220 avankest 1426:
1.216 avankest 1427: </ol>
1.218 avankest 1428:
1.248 avankest 1429:
1430:
1.203 avankest 1431:
1432: <h4>The <code title="">abort()</code> method</h4>
1.295 avankest 1433:
1.275 avankest 1434: <dl class="domintro">
1435: <dt><var title="">client</var> . <code title="dom-XMLHttpRequest-abort">abort()</code></dt>
1436: <dd>Cancels any network activity.</dd>
1437: </dl>
1.203 avankest 1438:
1.275 avankest 1439: <p>When the
1440: <dfn id="dom-xmlhttprequest-abort" title="dom-XMLHttpRequest-abort"><code>abort()</code></dfn>
1441: method is invoked, the user agent <em class="ct">must</em> run these steps
1.314 avankest 1442: (unless otherwise noted). This algorithm can be
1443: <dfn title="terminate abort()">terminated</dfn> by invoking the
1444: <code title="dom-XMLHttpRequest-open">open()</code> method. When it is
1445: <span title="terminate abort()">terminated</span> the user agent
1446: <em class="ct">must</em> terminate the algorithm after finishing the step
1447: it is on.</p>
1448:
1449: <p class="note">The <code title="dom-XMLHttpRequest-abort">abort()</code>
1450: algorithm can only be terminated by invoking
1451: <code title="dom-XMLHttpRequest-open">open()</code> from an event
1452: handler.</p>
1.12 avankest 1453:
1.203 avankest 1454: <ol>
1.314 avankest 1455: <li><p><span title="terminate send()">Terminate the <code>send()</code> algorithm</span>.</p></li>
1.203 avankest 1456:
1457: <li><p>The user agent <em class="ct">should</em> cancel any network
1458: activity for which the object is responsible.</p></li>
1.252 avankest 1459:
1460: <li><p>If there are any <span title="task">tasks</span> from the object's
1461: <span><code>XMLHttpRequest</code> task source</span> in one of the
1462: <span>task queues</span>, then remove those tasks.</p></li>
1.203 avankest 1463:
1464: <li><p>Set the <span>error flag</span> to true.</p></li>
1465:
1466: <li>
1.272 avankest 1467: <p>If the state is <span title="dom-XMLHttpRequest-UNSENT">UNSENT</span>,
1468: <span title="dom-XMLHttpRequest-OPENED">OPENED</span> with the
1.203 avankest 1469: <span><code>send()</code> flag</span> being false, or
1.272 avankest 1470: <span title="dom-XMLHttpRequest-DONE">DONE</span> go to the next step.</p>
1.12 avankest 1471:
1.203 avankest 1472: <p>Otherwise run these substeps:</p>
1.58 avankest 1473:
1474: <ol>
1.272 avankest 1475: <li><p>Switch the state to <span title="dom-XMLHttpRequest-DONE">DONE</span>.</p></li>
1.170 avankest 1476:
1.203 avankest 1477: <li><p>Set the <span><code>send()</code> flag</span> to false.</p></li>
1.96 avankest 1478:
1.203 avankest 1479: <li><p><span>Dispatch a <code>readystatechange</code> event</span>.</p></li>
1.248 avankest 1480:
1481:
1.58 avankest 1482: </ol>
1.250 avankest 1483:
1.248 avankest 1484:
1.250 avankest 1485: <p class="note">A future version of this specification will dispatch an
1.273 avankest 1486: <code title="event-xhr-abort">abort</code> event here.</p>
1.248 avankest 1487:
1.203 avankest 1488: </li>
1489:
1490: <li>
1.272 avankest 1491: <p>Switch the state to <span title="dom-XMLHttpRequest-UNSENT">UNSENT</span>.</p>
1.203 avankest 1492:
1.273 avankest 1493: <p class="note">No <code title="event-xhr-readystatechange">readystatechange</code> event is dispatched.</p>
1.203 avankest 1494: </li>
1495: </ol>
1496:
1497:
1498:
1.205 avankest 1499: <h3 id="response">Response</h3>
1.203 avankest 1500:
1501: <h4>The <code title="">status</code> attribute</h4>
1502:
1.276 avankest 1503: <dl class="domintro">
1504: <dt><var title="">client</var> . <code title="dom-XMLHttpRequest-status">status</code></dt>
1505: <dd><p>Returns the HTTP status code.</p></dd>
1506: </dl>
1507:
1508: <p>The
1509: <dfn id="dom-xmlhttprequest-status" title="dom-XMLHttpRequest-status"><code>status</code></dfn>
1510: attribute <em class="ct">must</em> return the result of running these
1511: steps:</p>
1.226 avankest 1512:
1.222 avankest 1513: <ol>
1.272 avankest 1514: <li><p>If the state is <span title="dom-XMLHttpRequest-UNSENT">UNSENT</span> or
1515: <span title="dom-XMLHttpRequest-OPENED">OPENED</span> return 0 and terminate these
1.222 avankest 1516: steps.</p></li>
1517:
1.239 avankest 1518: <li><p>If the <span>error flag</span> is true return 0 and terminate
1519: these steps.</p></li>
1.295 avankest 1520:
1.222 avankest 1521: <li><p>Return the HTTP status code.</p></li>
1.295 avankest 1522: </ol>
1.203 avankest 1523:
1524:
1525: <h4>The <code title="">statusText</code> attribute</h4>
1526:
1.276 avankest 1527: <dl class="domintro">
1528: <dt><var title="">client</var> . <code title="dom-XMLHttpRequest-statusText">statusText</code></dt>
1529: <dd><p>Returns the HTTP status text.</p></dd>
1530: </dl>
1531:
1532: <p>The
1533: <dfn id="dom-xmlhttprequest-statustext" title="dom-XMLHttpRequest-statusText"><code>statusText</code></dfn>
1534: attribute <em class="ct">must</em> return the result of running these
1535: steps:</p>
1.295 avankest 1536:
1.222 avankest 1537: <ol>
1.272 avankest 1538: <li><p>If the state is <span title="dom-XMLHttpRequest-UNSENT">UNSENT</span> or
1539: <span title="dom-XMLHttpRequest-OPENED">OPENED</span> return the empty string and
1.239 avankest 1540: terminate these steps.</p></li>
1.222 avankest 1541:
1542: <li><p>If the <span>error flag</span> is true return the empty string and
1543: terminate these steps.</p></li>
1.295 avankest 1544:
1.222 avankest 1545: <li><p>Return the HTTP status text.</p></li>
1546: </ol>
1.203 avankest 1547:
1548:
1549: <h4>The <code title="">getResponseHeader()</code> method</h4>
1550:
1.278 avankest 1551: <dl class="domintro">
1552: <dt><var title="">client</var> . <code title="dom-XMLHttpRequest-getResponseHeader">getResponseHeader(<var title="">header</var>)</dt>
1553: <dd><p>Returns the header field value from the response of which the
1554: field name matches <var title="">header</var>, unless the field name is
1555: <code>Set-Cookie</code> or <code>Set-Cookie2</code>.</p></dd>
1556: </dl>
1557:
1.203 avankest 1558: <p>When the
1.278 avankest 1559: <dfn id="dom-xmlhttprequest-getresponseheader" title="dom-XMLHttpRequest-getResponseHeader"><code>getResponseHeader(<var title="">header</var>)</code></dfn>
1.217 avankest 1560: is invoked, the user agent <em class="ct">must</em> run these steps:</p>
1.203 avankest 1561:
1562: <ol>
1.272 avankest 1563: <li><p>If the state is <span title="dom-XMLHttpRequest-UNSENT">UNSENT</span> or
1564: <span title="dom-XMLHttpRequest-OPENED">OPENED</span> return null and terminate these
1.203 avankest 1565: steps.</p></li>
1566:
1.239 avankest 1567: <li><p>If the <span>error flag</span> is true return null
1.203 avankest 1568: and terminate these steps.</p></li>
1569:
1.256 avankest 1570: <li><p>If any code point in <var>header</var> is higher than
1571: U+00FF LATIN SMALL LETTER Y WITH DIAERESIS return null and terminate
1572: these steps.</p></li>
1.295 avankest 1573:
1.256 avankest 1574: <li><p>Let <var>header</var> be the result of
1.294 avankest 1575: <span title="deflate a DOMString into a byte sequence">deflating</span>
1.256 avankest 1576: <var>header</var>.</p></li> <!-- This sounds lame, but it works. -->
1577:
1578: <li><p>If <var>header</var> is a case-insensitive match for
1579: <code>Set-Cookie</code> or <code>Set-Cookie2</code> return null and
1580: terminate these steps.</p></li>
1.203 avankest 1581:
1.256 avankest 1582: <li><p>If <var>header</var> is a case-insensitive match for multiple HTTP
1583: response headers, return the
1.294 avankest 1584: <span title="inflate a byte sequence into a DOMString">inflated</span>
1.256 avankest 1585: values of these headers as a single concatenated string separated from
1586: each other by a U+002C COMMA U+0020 SPACE character pair and terminate
1587: these steps.</p></li>
1.203 avankest 1588:
1.256 avankest 1589: <li><p>If <var>header</var> is a case-insensitive match for a single HTTP
1590: response header, return the
1.294 avankest 1591: <span title="inflate a byte sequence into a DOMString">inflated</span>
1.256 avankest 1592: value of that header and terminate these steps.</p></li>
1.203 avankest 1593:
1.239 avankest 1594: <li><p>Return null.</p></li>
1.203 avankest 1595: </ol>
1596:
1.248 avankest 1597:
1598:
1.203 avankest 1599: <div class="example">
1.295 avankest 1600:
1.250 avankest 1601: <p>For the following script:</p>
1602:
1603: <pre><code>var client = new XMLHttpRequest();
1604: client.open("GET", "unicorns-are-teh-awesome.txt", true);
1.5 avankest 1605: client.send();
1.12 avankest 1606: client.onreadystatechange = function() {
1.250 avankest 1607: if(this.readyState == 2) {
1608: print(client.getResponseHeader("Content-Type"));
1609: }
1610: }</code></pre>
1611:
1612: <p>The <code>print()</code> function will get to process something
1613: like:</p>
1.5 avankest 1614:
1.250 avankest 1615: <pre><code>text/plain; charset=UTF-8</code></pre>
1.203 avankest 1616: </div>
1.12 avankest 1617:
1618:
1.203 avankest 1619: <h4>The <code title="">getAllResponseHeaders()</code> method</h4>
1.14 avankest 1620:
1.278 avankest 1621: <dl class="domintro">
1622: <dt><var title="">client</var> . <code title="dom-XMLHttpRequest-getAllResponseHeaders">getAllResponseHeaders()</dt>
1623: <dd><p>Returns all headers from the response, with the exception of those
1624: whose field name is <code>Set-Cookie</code> or
1625: <code>Set-Cookie2</code>.</p></dd>
1626: </dl>
1627:
1.203 avankest 1628: <p>When the
1.293 avankest 1629: <dfn id="dom-xmlhttprequest-getallresponseheaders" title="dom-XMLHttpRequest-getAllResponseHeaders"><code>getAllResponseHeaders()</code></dfn>
1.203 avankest 1630: method is invoked, the user agent <em class="ct">must</em> run the
1631: following steps:</p>
1.58 avankest 1632:
1.203 avankest 1633: <ol>
1.272 avankest 1634: <li><p>If the state is <span title="dom-XMLHttpRequest-UNSENT">UNSENT</span> or
1635: <span title="dom-XMLHttpRequest-OPENED">OPENED</span> return the empty string and
1.239 avankest 1636: terminate these steps.</p></li>
1.203 avankest 1637:
1638: <li><p>If the <span>error flag</span> is true return the empty string and
1639: terminate these steps.</p></li>
1640:
1.256 avankest 1641: <li><p>Return all the HTTP headers, excluding headers that are a
1642: case-insensitive match for <code>Set-Cookie</code> or
1643: <code>Set-Cookie2</code>,
1.294 avankest 1644: <span title="inflate a byte sequence into a DOMString">inflated</span>,
1.256 avankest 1645: as a single string, with each header line
1646: separated by a U+000D CR U+000A LF pair, excluding the status line, and
1.203 avankest 1647: with each header name and header value separated by a
1648: U+003A COLON U+0020 SPACE pair.</p></li>
1649: </ol>
1.58 avankest 1650:
1.250 avankest 1651:
1652:
1.203 avankest 1653: <div class="example">
1.250 avankest 1654: <p>For the following script:</p>
1.295 avankest 1655:
1.250 avankest 1656: <pre><code>var client = new XMLHttpRequest();
1657: client.open("GET", "narwhals-too.txt", true);
1.5 avankest 1658: client.send();
1.12 avankest 1659: client.onreadystatechange = function() {
1.308 avankest 1660: if(this.readyState == 2) {
1661: print(this.getAllResponseHeaders());
1662: }
1.250 avankest 1663: }</code></pre>
1664:
1665: <p>The <code>print()</code> function will get to process something
1666: like:</p>
1.1 avankest 1667:
1.250 avankest 1668: <pre><code>Date: Sun, 24 Oct 2004 04:58:38 GMT
1.203 avankest 1669: Server: Apache/1.3.31 (Unix)
1670: Keep-Alive: timeout=15, max=99
1671: Connection: Keep-Alive
1672: Transfer-Encoding: chunked
1673: Content-Type: text/plain; charset=utf-8</code></pre>
1674: </div>
1675:
1.250 avankest 1676:
1.203 avankest 1677:
1678: <h4>Response Entity Body</h4>
1679:
1.248 avankest 1680: <p>The <dfn id="response-mime-type">response MIME type</dfn> is the MIME
1681: type the <code>Content-Type</code> header contains without any
1682: parameters or null if the header could not be parsed properly or was
1683: omitted. The <dfn id="override-mime-type">override MIME type</dfn> is
1684: always null. <dfn id="final-mime-type">Final MIME type</dfn> is the
1685: override MIME type unless that is null in which case it is the response
1686: MIME type.</p>
1687:
1688: <p>The <dfn id="response-charset">response charset</dfn> is the value of
1689: the <code>charset</code> parameter of the <code>Content-Type</code> header
1690: or null if there was no <code>charset</code> parameter or if
1691: the header could not be parsed properly or was omitted. The
1692: <dfn id="override-charset">override charset</dfn> is always null.
1693: <dfn id="final-charset">Final charset</dfn> is the override charset unless
1694: that is null in which case it is the response charset.</p>
1.250 avankest 1695:
1.248 avankest 1696:
1697: <p class="note"><span>Override MIME type</span> and
1698: <span>override charset</span> are introduced here solely to make editing
1699: several levels of XMLHttpRequest simultaneously somewhat easier. Apologies
1700: for any confusion they might cause.</p>
1701:
1.250 avankest 1702:
1.248 avankest 1703: <hr>
1704:
1.203 avankest 1705: <p>The <dfn id="response-entity-body">response entity body</dfn> is the
1.255 avankest 1706: fragment of the <span>entity body</span> of the response received so far
1.272 avankest 1707: (<span title="dom-XMLHttpRequest-LOADING">LOADING</span>) or the complete entity body
1708: of the response (<span title="dom-XMLHttpRequest-DONE">DONE</span>). If the response
1.255 avankest 1709: does not have an entity body the response entity body is null.</p>
1710:
1711: <p class="note">The <span>response entity body</span> is updated as part
1.271 avankest 1712: of the <code title="dom-XMLHttpRequest-send">send()</code> algorithm.</p>
1.250 avankest 1713:
1.203 avankest 1714: <hr>
1715:
1716: <p>The <dfn id="text-response-entity-body">text response entity body</dfn>
1.248 avankest 1717: is a <code>DOMString</code> representing the <span>response entity
1718: body</span>. The text response entity body is the return value of the
1.203 avankest 1719: following algorithm:</p>
1720:
1721: <ol>
1.248 avankest 1722: <li><p>If the response entity body is null return the empty string and
1723: terminate these steps.</p>
1724:
1725: <li><p>Let <var>charset</var> be the <span>final charset</span>.</p></li>
1.203 avankest 1726:
1.248 avankest 1727: <li><p>Let <var>mime</var> be the <span>final MIME type</span>.</p></li>
1.203 avankest 1728:
1.248 avankest 1729: <li><p>If <var>charset</var> is null and <var>mime</var> is null,
1.203 avankest 1730: <code>text/xml</code>, <code>application/xml</code> or ends in
1.248 avankest 1731: <code title="">+xml</code> use the rules set forth in the XML
1732: specifications to determine the character encoding. Let
1733: <var>charset</var> be the determined character encoding.</p></li>
1734:
1735: <li><p>If <var>charset</var> is null and <var>mime</var> is
1736: <code>text/html</code> follow the rules set forth in the HTML
1737: specification to determine the character encoding. Let
1.203 avankest 1738: <var>charset</var> be the determined character encoding.
1739: [<cite><span>HTML5</span></cite>]</p></li>
1740:
1741: <li>
1742: <p>If <var>charset</var> is null then, for each of the rows in the
1743: following table, starting with the first one and going down, if the first
1744: bytes of <var>bytes</var> match the bytes given in the first column, then
1745: let <var>charset</var> be the encoding given in the cell in the second
1746: column of that row. If there is no match <var>charset</var> remains
1747: null.</p>
1748:
1749: <table>
1750: <thead>
1751: <tr>
1752: <th>Bytes in Hexadecimal
1753: <th>Description
1.237 avankest 1754: <tbody>
1.203 avankest 1755: <tr>
1756: <td>FE FF
1757: <td>UTF-16BE BOM
1758: <tr>
1759: <td>FF FE
1760: <td>UTF-16LE BOM
1761: <tr>
1762: <td>EF BB BF
1.237 avankest 1763: <td>UTF-8 BOM
1.203 avankest 1764: </table>
1765: </li>
1766:
1767: <li><p>If <var>charset</var> is null let <var>charset</var> be
1768: UTF-8.</p></li>
1769:
1770: <li><p>Return the result of decoding the response entity body using
1771: <var>charset</var>. Replace bytes or sequences of bytes that are not
1.248 avankest 1772: valid accordng to the <var>charset</var> with a single
1.315 avankest 1773: U+FFFD REPLACEMENT CHARACTER character. Remove one leading
1774: U+FEFF BYTE ORDER MARK character, if present.</p></li>
1.203 avankest 1775: </ol>
1776:
1.315 avankest 1777: <p class="note">Authors are strongly encouraged to always encode their
1778: resources using UTF-8.</p>
1.295 avankest 1779:
1.203 avankest 1780: <hr>
1781:
1.248 avankest 1782: <p>The <dfn id="document-response-entity-body">document response entity
1783: body</dfn> is either a <code>Document</code> representing the
1.317 ! avankest 1784: <span>response entity body</span> or null. If the
! 1785: <span>document response entity body</span> has no value assigned to it let
! 1786: it be the return value of the following algorithm:</p>
1.12 avankest 1787:
1.203 avankest 1788: <ol>
1.309 avankest 1789: <li><p>If the <span>response entity body</span> is null, return null and
1790: terminate these steps.</p></li>
1.12 avankest 1791:
1.248 avankest 1792: <li><p>If <span>final MIME type</span> is not null,
1793: <code>text/xml</code>,
1.295 avankest 1794: <code>application/xml</code>, or does not end in
1.309 avankest 1795: <code title="">+xml</code>, return null and terminate these
1796: steps.</p></li>
1.248 avankest 1797:
1798:
1.203 avankest 1799:
1800: <li>
1.265 avankest 1801: <p>Let <var>document</var> be a
1802: <span>cookie-free <code>Document</code> object</span> that represents
1803: the result of parsing the response entity body into a document tree
1804: following the rules from the XML specifications. If this fails
1805: (unsupported character encoding, namespace well-formedness error et
1.309 avankest 1806: cetera) return null and terminate these steps.
1.265 avankest 1807: [<cite><span>XML</span></cite>]</p>
1.248 avankest 1808:
1809: <p class="note">Scripts in the resulting document tree will not be executed,
1810: resources referenced will not be loaded and no associated XSLT will be
1811: applied.</p>
1.203 avankest 1812: </li>
1.88 avankest 1813:
1.248 avankest 1814: <li><p>Return <var>document</var>.</p></li>
1.203 avankest 1815: </ol>
1.12 avankest 1816:
1.248 avankest 1817:
1818:
1819:
1.203 avankest 1820: <h4>The <code title="">responseText</code> attribute</h4>
1.12 avankest 1821:
1.276 avankest 1822: <dl class="domintro">
1823: <dt><var title="">client</var> . <code title="dom-XMLHttpRequest-responseText">responseText</code></dt>
1.305 avankest 1824: <dd>
1825: <p>Returns the <span>text response entity body</span>.</p>
1826:
1827: </dd>
1.276 avankest 1828: </dl>
1829:
1830: <p>The
1831: <dfn id="dom-xmlhttprequest-responsetext" title="dom-XMLHttpRequest-responseText"><code>responseText</code></dfn>
1832: attribute <em class="ct">must</em> return the result of running these
1833: steps:</p>
1.79 avankest 1834:
1.203 avankest 1835: <ol>
1.305 avankest 1836:
1837:
1.272 avankest 1838: <li><p>If the state is not <span title="dom-XMLHttpRequest-LOADING">LOADING</span> or
1839: <span title="dom-XMLHttpRequest-DONE">DONE</span> return the empty string and
1.203 avankest 1840: terminate these steps.</p></li>
1.75 avankest 1841:
1.313 avankest 1842: <li><p>If the <span>error flag</span> is true return the empty string and
1843: terminate these steps.</p></li>
1844:
1.203 avankest 1845: <li><p>Return the <span>text response entity body</span>.</p></li>
1846: </ol>
1.12 avankest 1847:
1848:
1.203 avankest 1849: <h4>The <code title="">responseXML</code> attribute</h4>
1.12 avankest 1850:
1.276 avankest 1851: <dl class="domintro">
1852: <dt><var title="">client</var> . <code title="dom-XMLHttpRequest-responseXML">responseXML</code></dt>
1.305 avankest 1853: <dd>
1854: <p>Returns the <span>document response entity body</span>.</p>
1855:
1856: </dd>
1.276 avankest 1857: </dl>
1858:
1859: <p>The
1860: <dfn id="dom-xmlhttprequest-responsexml" title="dom-XMLHttpRequest-responseXML"><code>responseXML</code></dfn>
1861: attribute <em class="ct">must</em> return the result of running these
1862: steps:</p>
1.12 avankest 1863:
1.203 avankest 1864: <ol>
1.305 avankest 1865:
1866:
1.272 avankest 1867: <li><p>If the state is not <span title="dom-XMLHttpRequest-DONE">DONE</span> return
1.239 avankest 1868: null and terminate these steps.</p></li>
1.12 avankest 1869:
1.313 avankest 1870: <li><p>If the <span>error flag</span> is true return null and terminate
1871: these steps.</p></li>
1872:
1.317 ! avankest 1873: <li><p>Return the <span>document response entity body</span>.</p></li>
1.203 avankest 1874: </ol>
1.121 avankest 1875:
1.248 avankest 1876:
1877:
1.12 avankest 1878:
1.240 avankest 1879: <h2 id="exceptions">Exceptions</h2>
1.24 avankest 1880:
1.138 avankest 1881: <p>Several algorithms in this specification may result in an exception
1882: being thrown. These exceptions are all part of the group
1.185 avankest 1883: <code>ExceptionCode</code> and use the <code>DOMException</code> object,
1.138 avankest 1884: which is defined in DOM Level 3 Core. In addition this specification
1885: extends the <code>ExceptionCode</code> group with several new
1886: constants as indicated below. [<cite><span>DOM3Core</span></cite>]</p>
1.203 avankest 1887:
1.193 avankest 1888: <p class="note">Thus, exceptions used by this specification and not
1889: defined in this section are defined by DOM Level 3 Core.</p>
1.31 avankest 1890:
1.138 avankest 1891: <pre class="idl">const unsigned short <span>SECURITY_ERR</span> = 18;
1.199 avankest 1892: const unsigned short <span>NETWORK_ERR</span> = 19;
1893: const unsigned short <span>ABORT_ERR</span> = 20;</pre>
1.31 avankest 1894:
1.138 avankest 1895: <p>The <dfn id="security-err"><code>SECURITY_ERR</code></dfn> exception is
1896: raised if an attempt is made to perform an operation or access some data
1897: in a way that would be a security risk or a violation of the user agent's
1898: security policy.</p>
1899:
1900: <!-- http://lists.w3.org/Archives/Public/public-webapi/2006May/0027.html -->
1901:
1.33 avankest 1902: <p>The <dfn id="network-err"><code>NETWORK_ERR</code></dfn> exception is
1.138 avankest 1903: raised when a network error occurs in synchronous requests.</p>
1.121 avankest 1904:
1.138 avankest 1905: <p>The <dfn id="abort-err"><code>ABORT_ERR</code></dfn> exception is
1906: raised when the user aborts a request in synchronous requests.</p>
1.295 avankest 1907:
1.248 avankest 1908:
1.203 avankest 1909:
1.240 avankest 1910: <p class="note">These exceptions will be folded into an update of
1.199 avankest 1911: DOM Level 3 Core in due course, as they are appropriate for other API
1912: specifications as well.</p>
1.121 avankest 1913:
1.29 avankest 1914:
1.203 avankest 1915:
1.248 avankest 1916:
1917:
1.203 avankest 1918:
1.248 avankest 1919: <h2 class="no-num" id="references">References</h2>
1.203 avankest 1920:
1.177 avankest 1921: <p>Unless marked "Non-normative" these references are normative.</p>
1.11 avankest 1922:
1.6 avankest 1923: <dl>
1.230 avankest 1924: <dt>[<dfn id="ref-cookies">COOKIES</dfn>]</dt>
1.268 avankest 1925: <dd><cite><a href="http://tools.ietf.org/html/draft-ietf-httpstate-cookie">HTTP
1926: State Management Mechanism</a></cite> (work in progress), A. Barth. IETF.</dd>
1.203 avankest 1927:
1.248 avankest 1928:
1929:
1.155 avankest 1930: <dt>[<dfn id="ref-dom2events">DOM2Events</dfn>]</dt>
1931: <dd><cite><a href="http://www.w3.org/TR/DOM-Level-2-Events/">Document
1.267 avankest 1932: Object Model (DOM) Level 2 Events Specification</a></cite>, T. Pixley.
1933: W3C.</dd>
1.155 avankest 1934:
1.145 avankest 1935: <dt>[<dfn id="ref-dom3core">DOM3Core</dfn>]</dt>
1.11 avankest 1936: <dd><cite><a href="http://www.w3.org/TR/DOM-Level-3-Core">Document Object
1.92 avankest 1937: Model (DOM) Level 3 Core Specification</a></cite>, A. Le Hors, P. Le
1.267 avankest 1938: Hégaret, L. Wood, G. Nicol, J. Robie, M. Champion, S. Byrne.
1939: W3C.</dd>
1.11 avankest 1940:
1.117 avankest 1941: <dt>[<dfn id="ref-ecmascript">ECMAScript</dfn>]</dt>
1.92 avankest 1942: <dd><cite><a href="http://www.ecma-international.org/publications/standards/Ecma-262.htm">ECMAScript
1.267 avankest 1943: Language Specification</a></cite>. ECMA.</dd>
1.295 avankest 1944:
1.248 avankest 1945:
1.171 avankest 1946:
1.145 avankest 1947: <dt>[<dfn id="ref-html5">HTML5</dfn>]</dt>
1.250 avankest 1948: <dd><cite><a href="http://www.w3.org/html/wg/html5/">HTML5</a></cite>
1.267 avankest 1949: (work in progress), I. Hickson. W3C.</dd>
1.290 avankest 1950: <dd><cite><a href="http://www.whatwg.org/specs/web-apps/current-work/">HTML5</a></cite>
1.267 avankest 1951: (work in progress), I. Hickson. WHATWG.</dd>
1.198 avankest 1952:
1953: <dt>[<dfn id="ref-httpverbsec">HTTPVERBSEC</dfn>]</dt>
1.248 avankest 1954: <dd>(Non-normative)
1955: <cite><a href="http://www.kb.cert.org/vuls/id/867593">Multiple vendors'
1956: web servers enable HTTP TRACE method by default</a></cite>, US-CERT.</dd>
1957: <dd>(Non-normative)
1958: <cite><a href="http://www.kb.cert.org/vuls/id/288308">Microsoft Internet
1959: Information Server (IIS) vulnerable to cross-site scripting via HTTP
1960: TRACK method</a></cite>, US-CERT.</dd>
1961: <dd>(Non-normative)
1962: <cite><a href="http://www.kb.cert.org/vuls/id/150227">HTTP proxy default
1963: configurations allow arbitrary TCP connections</a></cite>, US-CERT.</dd>
1964:
1965:
1966:
1967: <dt>[<dfn id="ref-rfc2046">RFC2046</dfn>]</dt>
1968: <dd><cite><a href="http://ietf.org/rfc/rfc2046">Multipurpose Internet Mail
1969: Extensions (MIME) Part Two: Media Types</a></cite>, N. Freed, N.
1.267 avankest 1970: Borenstein. IETF.</dd>
1.198 avankest 1971:
1.145 avankest 1972: <dt>[<dfn id="ref-rfc2119">RFC2119</dfn>]</dt>
1.117 avankest 1973: <dd><cite><a href="http://ietf.org/rfc/rfc2119">Key words for use in RFCs to
1.267 avankest 1974: Indicate Requirement Levels</a></cite>, S. Bradner. IETF.</dd>
1.12 avankest 1975:
1.248 avankest 1976: <dt>[<dfn id="rfc-rfc2616">RFC2616</dfn>]</dt>
1.11 avankest 1977: <dd><cite><a href="http://ietf.org/rfc/rfc2616">Hypertext Transfer Protocol
1.92 avankest 1978: -- HTTP/1.1</a></cite>, R. Fielding, J. Gettys, J. Mogul, H. Frystyk, L.
1.267 avankest 1979: Masinter, P. Leach, T. Berners-Lee. IETF.</dd>
1.12 avankest 1980:
1.37 avankest 1981: <dt>[<dfn id="ref-rfc2617">RFC2617</dfn>]</dt>
1.11 avankest 1982: <dd><cite><a href="http://ietf.org/rfc/rfc2617">HTTP Authentication: Basic
1.92 avankest 1983: and Digest Access Authentication</a></cite>, P. Hallam-Baker, J.
1.267 avankest 1984: Hostetler, S. Lawrence, P. Leach, A. Luotonen, L. Stewart. IETF.</dd>
1.12 avankest 1985:
1.37 avankest 1986: <dt>[<dfn id="ref-rfc3986">RFC3986</dfn>]</dt>
1.11 avankest 1987: <dd><cite><a href="http://ietf.org/rfc/rfc3986">Uniform Resource Identifier
1.267 avankest 1988: (URI): Generic Syntax</a></cite>, T. Berners-Lee, R. Fielding, L.
1989: Masinter. IETF.</dd>
1.184 avankest 1990:
1.248 avankest 1991: <dt>[<dfn id=ref-rfc3987>RFC3987</dfn>]</dt>
1992: <dd><cite><a href="http://ietf.org/rfc/rfc3987">Internationalized
1.267 avankest 1993: Resource Identifiers (IRIs)</a></cite>, M. Duerst, M. Suignard.
1994: IETF.</dd>
1.248 avankest 1995:
1.203 avankest 1996: <dt>[<dfn id="ref-webidl">WebIDL</dfn>]</dt>
1.200 avankest 1997: <dd><cite><a href="http://dev.w3.org/2006/webapi/WebIDL/">Web
1.267 avankest 1998: IDL</a></cite> (work in progress), C. McCormack. W3C.</dd> <!-- XXX add Sam -->
1.181 avankest 1999:
1.92 avankest 2000: <dt>[<dfn id="ref-xml">XML</dfn>]</dt>
2001: <dd><cite><a href="http://www.w3.org/TR/xml/">Extensible Markup Language
1.267 avankest 2002: (XML) 1.0</a></cite>, T. Bray, J. Paoli, C. Sperberg-McQueen, E. Maler,
2003: F. Yergeau. W3C.</dd>
2004: <dd><cite><a href="http://www.w3.org/TR/xml-names/">Namespaces in
2005: XML</a></cite>, T. Bray, D. Hollander, A. Layman, R. Tobin, H. S.
2006: Thompson. W3C.</dd>
1.1 avankest 2007: </dl>
1.11 avankest 2008:
1.203 avankest 2009:
2010:
1.130 avankest 2011: <h2 class="no-num" id="acknowledgments">Acknowledgments</h2>
1.11 avankest 2012:
1.159 avankest 2013: <p>The editor would like to thank
1.12 avankest 2014:
1.163 avankest 2015: Addison Phillips,
1.159 avankest 2016: Ahmed Kamel,
2017: Alex Hopmann,
2018: Alex Vincent,
2019: Alexey Proskuryakov,
2020: Asbjørn Ulsberg,
2021: Boris Zbarsky,
2022: Björn Höhrmann,
2023: Cameron McCormack,
2024: Christophe Jolif,
2025: Charles McCathieNevile,
2026: Dan Winship,
1.248 avankest 2027: David Andersson,
1.159 avankest 2028: David Håsäther,
1.248 avankest 2029: David Levin,
1.159 avankest 2030: Dean Jackson,
2031: Denis Sureau,
2032: Doug Schepers,
2033: Douglas Livingstone,
2034: Elliotte Harold,
2035: Eric Lawrence,
1.196 avankest 2036: Erik Dahlström,
1.163 avankest 2037: Geoffrey Sneddon,
1.159 avankest 2038: Gideon Cohn,
2039: Gorm Haug Eriksen,
1.247 avankest 2040: Håkon Wium Lie,
1.159 avankest 2041: Hallvord R. M. Steen,
1.247 avankest 2042: Huub Schaeks,
1.159 avankest 2043: Ian Davis,
2044: Ian Hickson,
2045: Ivan Herman,
2046: Jeff Walden,
2047: Jens Lindström,
2048: Jim Deegan,
2049: Jim Ley,
2050: Joe Farro,
2051: Jonas Sicking,
2052: Julian Reschke,
2053: Karl Dubost,
1.175 avankest 2054: Lachlan Hunt,
1.159 avankest 2055: Maciej Stachowiak,
2056: Magnus Kristiansen,
2057: Marc Hadley,
2058: Marcos Caceres,
2059: Mark Baker,
1.203 avankest 2060: Mark Birbeck,
1.159 avankest 2061: Mark Nottingham,
1.267 avankest 2062: Mark S. Miller,
1.248 avankest 2063: Martin Hassman,
1.159 avankest 2064: Mohamed Zergaoui,
1.256 avankest 2065: Olli Pettay,
1.159 avankest 2066: Pawel Glowacki,
1.231 avankest 2067: Peter Michaux,
1.264 avankest 2068: Philip Taylor,
1.159 avankest 2069: Robin Berjon,
1.248 avankest 2070: Rune Halvorsen,
1.159 avankest 2071: Ruud Steltenpool,
1.310 avankest 2072: Sergiu Dumitriu,
1.159 avankest 2073: Simon Pieters,
2074: Stewart Brodie,
2075: Sunava Dutta,
1.186 avankest 2076: Thomas Roessler,
1.203 avankest 2077: Tom Magliery, and
1.159 avankest 2078: Zhenbin Xu
1.181 avankest 2079:
1.159 avankest 2080: for their contributions to this specification.</p>
1.12 avankest 2081:
1.1 avankest 2082: <p>Special thanks to the Microsoft employees who first implemented the
1.143 avankest 2083: <code title="">XMLHttpRequest</code> interface, which was first widely
2084: deployed by the Windows Internet Explorer browser.</p>
1.12 avankest 2085:
1.143 avankest 2086: <p>Special thanks also to the WHATWG for drafting an initial version of
2087: this specification in their Web Applications 1.0 document (now renamed to
1.250 avankest 2088: HTML5). [<cite><span>HTML5</span></cite>]</p>
1.12 avankest 2089:
1.143 avankest 2090: <p>Thanks also to all those who have helped to improve this specification
2091: by sending suggestions and corrections. (Please, keep bugging us with your
1.22 avankest 2092: issues!)</p>
1.1 avankest 2093: </body>
2094: </html>
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