Fixes #8152 by applying the same special cases for protocol "chrome-e…

…xtension:" as were for "file:" (needs tests). Re-organizes and fixes the handling of special cases for HTTP status code in the xhr transport. Also re-organizes the handling of document.location in ajax.js.

src/ajax.js

@@ -6,6 +6,8 @@ var r20 = /%20/g,
 	rhash = /#.*$/,
 	rheaders = /^(.*?):\s*(.*?)\r?$/mg, // IE leaves an \r character at EOL
 	rinput = /^(?:color|date|datetime|email|hidden|month|number|password|range|search|tel|text|time|url|week)$/i,
+	// #8125, #8152: local protocol detection
+	rlocalProtocol = /^(file|chrome\-extension):$/,
 	rnoContent = /^(?:GET|HEAD)$/,
 	rprotocol = /^\/\//,
 	rquery = /\?/,
@@ -36,8 +38,11 @@ var r20 = /%20/g,
 	 */
 	transports = {},
 
-	// Stored document location array
-	ajaxLocation;
+	// Document location
+	ajaxLocation,
+
+	// Document location segments
+	ajaxLocParts;
 
 // #8138, IE may throw an exception when accessing
 // a field from document.location if document.domain has been set
@@ -51,6 +56,9 @@ try {
 	ajaxLocation = ajaxLocation.href;
 }
 
+// Segment location into parts
+ajaxLocParts = rurl.exec( ajaxLocation.toLowerCase() );
+
 // Base "constructor" for jQuery.ajaxPrefilter and jQuery.ajaxTransport
 function addToPrefiltersOrTransports( structure ) {
 
@@ -276,6 +284,7 @@ jQuery.extend({
 
 	ajaxSettings: {
 		url: ajaxLocation,
+		isLocal: rlocalProtocol.test( ajaxLocParts[ 1 ] ),
 		global: true,
 		type: "GET",
 		contentType: "application/x-www-form-urlencoded",
@@ -562,7 +571,7 @@ jQuery.extend({
 		// Remove hash character (#7531: and string promotion)
 		// Add protocol if not provided (#5866: IE7 issue with protocol-less urls)
 		// We also use the url parameter if available
-		s.url = ( "" + ( url || s.url ) ).replace( rhash, "" ).replace( rprotocol, ajaxLocation[ 1 ] + "//" );
+		s.url = ( "" + ( url || s.url ) ).replace( rhash, "" ).replace( rprotocol, ajaxLocParts[ 1 ] + "//" );
 
 		// Extract dataTypes list
 		s.dataTypes = jQuery.trim( s.dataType || "*" ).toLowerCase().split( rspacesAjax );
@@ -571,9 +580,9 @@ jQuery.extend({
 		if ( !s.crossDomain ) {
 			parts = rurl.exec( s.url.toLowerCase() );
 			s.crossDomain = !!( parts &&
-				( parts[ 1 ] != ajaxLocation[ 1 ] || parts[ 2 ] != ajaxLocation[ 2 ] ||
+				( parts[ 1 ] != ajaxLocParts[ 1 ] || parts[ 2 ] != ajaxLocParts[ 2 ] ||
 					( parts[ 3 ] || ( parts[ 1 ] === "http:" ? 80 : 443 ) ) !=
-						( ajaxLocation[ 3 ] || ( ajaxLocation[ 1 ] === "http:" ? 80 : 443 ) ) )
+						( ajaxLocParts[ 3 ] || ( ajaxLocParts[ 1 ] === "http:" ? 80 : 443 ) ) )
 			);
 		}
 
@@ -730,9 +739,6 @@ jQuery.extend({
 	}
 });
 
-// Segment ajaxLocation into parts
-ajaxLocation = rurl.exec( ajaxLocation.toLowerCase() );
-
 function buildParams( prefix, obj, traditional, add ) {
 	if ( jQuery.isArray( obj ) && obj.length ) {
 		// Serialize array item.

src/ajax/xhr.js

@@ -22,7 +22,7 @@ jQuery.ajaxSettings.xhr = window.ActiveXObject ?
 	 * we need a fallback.
 	 */
 	function() {
-		if ( window.location.protocol !== "file:" ) {
+		if ( !jQuery.ajaxSettings.isLocal ) {
 			try {
 				return new window.XMLHttpRequest();
 			} catch( xhrError ) {}
@@ -175,30 +175,28 @@ if ( jQuery.support.ajax ) {
 									}
 
 									// 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
-											);
+
+									// IE - #1450: sometimes returns 1223 when it should be 204
+									if ( status === 1223 ) {
+										status = 204;
+									// Status 0 encompasses several cases
+									} else if ( !status ) {
+										// Cross-domain
+										if ( s.crossDomain ) {
+											if ( !s.statusText ) {
+												// FF, Webkit (other?): There is no status text for errors
+												// 302 is the most generic cross-domain status code
+												// for errors, could be anything really (even a real 0)
+												status = 302;
+											}
+										// All same-domain - #8125, #8152: for local files, 0 is a success
+										} else if( s.isLocal ) {
+											status = 200;
+										}
+										// Opera - #6060: sets status as 0 for 304
+										// and there doesn't seem to be any way to
+										// detect this case. Patch VERY welcome.
+									}
 								}
 							}
 						} catch( firefoxAccessException ) {