3 var // #5280: next active xhr id and list of active xhrs' callbacks
7 // XHR used to determine supports properties
10 // #5280: Internet Explorer will keep connections alive if we don't abort on unload
11 function xhrOnUnloadAbort() {
12 jQuery( window ).unload(function() {
13 // Abort all pending requests
14 for ( var key in xhrCallbacks ) {
15 xhrCallbacks[ key ]( 0, 1 );
20 // Functions to create xhrs
21 function createStandardXHR() {
23 return new window.XMLHttpRequest();
27 function createActiveXHR() {
29 return new window.ActiveXObject("Microsoft.XMLHTTP");
33 // Create the request object
34 // (This is still attached to ajaxSettings for backward compatibility)
35 jQuery.ajaxSettings.xhr = window.ActiveXObject ?
36 /* Microsoft failed to properly
37 * implement the XMLHttpRequest in IE7 (can't request local files),
38 * so we use the ActiveXObject when it is available
39 * Additionally XMLHttpRequest can be disabled in IE7/IE8 so
43 return !this.isLocal && createStandardXHR() || createActiveXHR();
45 // For all other browsers, use the standard XMLHttpRequest object
48 // Test if we can create an xhr object
49 testXHR = jQuery.ajaxSettings.xhr();
50 jQuery.support.ajax = !!testXHR;
52 // Does this browser support crossDomain XHR requests
53 jQuery.support.cors = testXHR && ( "withCredentials" in testXHR );
55 // No need for the temporary xhr anymore
58 // Create transport if the browser can provide an xhr
59 if ( jQuery.support.ajax ) {
61 jQuery.ajaxTransport(function( s ) {
62 // Cross domain only allowed if supported through XMLHttpRequest
63 if ( !s.crossDomain || jQuery.support.cors ) {
68 send: function( headers, complete ) {
76 // Passing null username, generates a login popup on Opera (#2865)
78 xhr.open( s.type, s.url, s.async, s.username, s.password );
80 xhr.open( s.type, s.url, s.async );
83 // Apply custom fields if provided
85 for ( i in s.xhrFields ) {
86 xhr[ i ] = s.xhrFields[ i ];
90 // Requested-With header
91 // Not set for crossDomain requests with no content
92 // (see why at http://trac.dojotoolkit.org/ticket/9486)
93 // Won't change header if already provided
94 if ( !( s.crossDomain && !s.hasContent ) && !headers["x-requested-with"] ) {
95 headers[ "x-requested-with" ] = "XMLHttpRequest";
98 // Need an extra try/catch for cross domain requests in Firefox 3
100 jQuery.each( headers, function( key, value ) {
101 xhr.setRequestHeader( key, value );
105 // Do send the request
106 // This may raise an exception which is actually
107 // handled in jQuery.ajax (so no try/catch here)
108 xhr.send( ( s.hasContent && s.data ) || null );
111 callback = function( _, isAbort ) {
119 // Firefox throws exceptions when accessing properties
120 // of an xhr when a network error occured
121 // http://helpful.knobs-dials.com/index.php/Component_returned_failure_code:_0x80040111_(NS_ERROR_NOT_AVAILABLE)
124 // Was never called and is aborted or complete
125 if ( callback && ( isAbort || xhr.readyState === 4 ) ) {
128 callback = undefined;
130 // Do not keep as active anymore
132 xhr.onreadystatechange = jQuery.noop;
133 delete xhrCallbacks[ handle ];
138 // Abort it manually if needed
139 if ( xhr.readyState !== 4 ) {
144 responseHeaders = xhr.getAllResponseHeaders();
146 xml = xhr.responseXML;
148 // Construct response list
149 if ( xml && xml.documentElement /* #4958 */ ) {
152 responses.text = xhr.responseText;
154 // Firefox throws an exception when accessing
155 // statusText for faulty cross-domain requests
157 statusText = xhr.statusText;
159 // We normalize with Webkit giving an empty statusText
163 // Filter status for non standard behaviors
165 // IE - #1450: sometimes returns 1223 when it should be 204
166 if ( status === 1223 ) {
168 // Various - #8177: a Not Modified response was received
169 // yet no conditional request headers was provided
170 } else if ( status === 304 &&
171 !headers[ "if-modified-since" ] &&
172 !headers[ "if-none-match" ] ) {
174 // Status 0 encompasses several cases
175 } else if ( !status ) {
177 if ( s.crossDomain ) {
178 if ( !s.statusText ) {
179 // FF, Webkit (other?): There is no status text for errors
180 // 302 is the most generic cross-domain status code
181 // for errors, could be anything really (even a real 0)
184 // All same-domain: for local files, 0 is a success
185 } else if( s.isLocal ) {
187 // Opera: this notifies success for all requests
188 // (verified in 11.01). Patch welcome.
190 // Opera - #6060: sets status as 0 for 304
195 } catch( firefoxAccessException ) {
197 complete( -1, firefoxAccessException );
201 // Call complete if needed
203 complete( status, statusText, responses, responseHeaders );
207 // if we're in sync mode or it's in cache
208 // and has been retrieved directly (IE6 & IE7)
209 // we need to manually fire the callback
210 if ( !s.async || xhr.readyState === 4 ) {
213 // Create the active xhrs callbacks list if needed
214 // and attach the unload handler
215 if ( !xhrCallbacks ) {
219 // Add to list of active xhrs callbacks
221 xhr.onreadystatechange = xhrCallbacks[ handle ] = callback;