+ // Listener
+ callback = function( _, isAbort ) {
+
+ var status,
+ statusText,
+ responseHeaders,
+ responses,
+ xml;
+
+ // Firefox throws exceptions when accessing properties
+ // of an xhr when a network error occured
+ // http://helpful.knobs-dials.com/index.php/Component_returned_failure_code:_0x80040111_(NS_ERROR_NOT_AVAILABLE)
+ try {
+
+ // Was never called and is aborted or complete
+ if ( callback && ( isAbort || xhr.readyState === 4 ) ) {
+
+ // Only called once
+ callback = undefined;
+
+ // Do not keep as active anymore
+ if ( handle ) {
+ xhr.onreadystatechange = jQuery.noop;
+ delete xhrs[ handle ];
+ }
+
+ // If it's an abort
+ if ( isAbort ) {
+ // Abort it manually if needed
+ if ( xhr.readyState !== 4 ) {
+ xhr.abort();
+ }
+ } else {
+ // Get info
+ status = xhr.status;
+ responseHeaders = xhr.getAllResponseHeaders();
+ responses = {};
+ xml = xhr.responseXML;
+
+ // Construct response list
+ if ( xml && xml.documentElement /* #4958 */ ) {
+ responses.xml = xml;
+ }
+ responses.text = xhr.responseText;
+
+ // Firefox throws an exception when accessing
+ // statusText for faulty cross-domain requests
+ try {
+ statusText = xhr.statusText;
+ } catch( e ) {
+ // We normalize with Webkit giving an empty statusText
+ statusText = "";
+ }
+
+ // Filter status for non standard behaviors
+ status =
+ // Most browsers return 0 when it should be 200 for local files
+ // Opera returns 0 when it should be 304
+ // Webkit returns 0 for failing cross-domain no matter the real status
+ !status ?
+ // All: for local files, 0 is a success
+ ( location.protocol === "file:" ? 200 : (
+ // Webkit, Firefox: filter out faulty cross-domain requests
+ !s.crossDomain || statusText ?
+ (
+ // Opera: filter out real aborts #6060
+ responseHeaders ?
+ 304 :
+ 0
+ ) :
+ // We assume 302 but could be anything cross-domain related
+ 302
+ ) ) :
+ (
+ // IE sometimes returns 1223 when it should be 204 (see #1450)
+ status == 1223 ?
+ 204 :
+ status
+ );
+ }