Fixes #7465. Reworked the regexp and associated test for cross-domain detection so that it now includes ports. Added cross-domain detection tests for protocol, hostname and port.

src/ajax.js

@@ -10,7 +10,7 @@ var r20 = /%20/g,
 	rscript = /<script\b[^<]*(?:(?!<\/script>)<[^<]*)*<\/script>/gi,
 	rselectTextarea = /^(?:select|textarea)/i,
 	rts = /([?&])_=[^&]*/,
-	rurl = /^(\w+:)?\/\/([^\/?#]+)/,
+	rurl = /^(\w+:)?\/\/([^\/?#:]+)(?::(\d+))?/,
 
 	// Slice function
 	sliceFunc = Array.prototype.slice,
@@ -520,7 +520,12 @@ jQuery.extend({
 		// Determine if a cross-domain request is in order
 		var parts = rurl.exec( s.url.toLowerCase() ),
 			loc = location;
-		s.crossDomain = !!( parts && ( parts[ 1 ] && parts[ 1 ] != loc.protocol || parts[ 2 ] != loc.host ) );
+		s.crossDomain = !!(
+				parts &&
+				( parts[ 1 ] && parts[ 1 ] != loc.protocol ||
+					parts[ 2 ] != loc.hostname ||
+					( parts[ 3 ] || 80 ) != ( loc.port || 80 ) )
+		);
 
 		// Convert data if not already a string
 		if ( s.data && s.processData && typeof s.data != "string" ) {