diff --git a/src/ajax.js b/src/ajax.js
index 4714afda..add3b373 100644
--- a/src/ajax.js
+++ b/src/ajax.js
@@ -7,7 +7,7 @@ var r20 = /%20/g,
 	rheaders = /^(.*?):[ \t]*([^\r\n]*)\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,
 	// #7653, #8125, #8152: local protocol detection
-	rlocalProtocol = /(?:^file|^widget|\-extension):$/,
+	rlocalProtocol = /^(?:about|app|app\-storage|.+\-extension|file|widget):$/,
 	rnoContent = /^(?:GET|HEAD)$/,
 	rprotocol = /^\/\//,
 	rquery = /\?/,
@@ -19,7 +19,7 @@ var r20 = /%20/g,
 	rucHeadersFunc = function( _, $1, $2 ) {
 		return $1 + $2.toUpperCase();
 	},
-	rurl = /^([\w\+\.\-]+:)(?:\/\/([^\/?#:]*)(?::(\d+))?|\/[^\/])/,
+	rurl = /^([\w\+\.\-]+:)(?:\/\/([^\/?#:]*)(?::(\d+))?)?/,
 
 	// Keep a copy of the old load method
 	_load = jQuery.fn.load,
@@ -61,7 +61,7 @@ try {
 }
 
 // Segment location into parts
-ajaxLocParts = rurl.exec( ajaxLocation.toLowerCase() );
+ajaxLocParts = rurl.exec( ajaxLocation.toLowerCase() ) || [];
 
 // Base "constructor" for jQuery.ajaxPrefilter and jQuery.ajaxTransport
 function addToPrefiltersOrTransports( structure ) {
diff --git a/test/unit/ajax.js b/test/unit/ajax.js
index 2a2ac46a..7c572a32 100644
--- a/test/unit/ajax.js
+++ b/test/unit/ajax.js
@@ -492,7 +492,7 @@ test(".ajax() - hash", function() {
 
 test("jQuery ajax - cross-domain detection", function() {
 
-	expect( 5 );
+	expect( 6 );
 
 	var loc = document.location,
 		otherPort = loc.port === 666 ? 667 : 666,
@@ -508,6 +508,7 @@ test("jQuery ajax - cross-domain detection", function() {
 	});
 
 	jQuery.ajax({
+		dataType: "jsonp",
 		url: 'app:/path',
 		beforeSend: function( _ , s ) {
 			ok( s.crossDomain , "Adobe AIR app:/ URL detected as cross-domain" );
@@ -533,6 +534,15 @@ test("jQuery ajax - cross-domain detection", function() {
 		}
 	});
 
+	jQuery.ajax({
+		dataType: "jsonp",
+		url: "about:blank",
+		beforeSend: function( _ , s ) {
+			ok( s.crossDomain , "Test about:blank is detected as cross-domain" );
+			return false;
+		}
+	});
+
 	jQuery.ajax({
 		dataType: "jsonp",
 		url: loc.protocol + "//" + loc.host,