Index: jquery/src/ajax.js
===================================================================
--- jquery/src/ajax.js	(revision 5914)
+++ jquery/src/ajax.js	(working copy)
@@ -446,7 +446,7 @@
 	httpSuccess: function( xhr ) {
 		try {
 			// IE error sometimes returns 1223 when it should be 204 so treat it as success, see #1450
-			return !xhr.status && location.protocol == "file:" ||
+			return !xhr.status && location.protocol !== "http:" && location.protocol !== "https:" ||
 				( xhr.status >= 200 && xhr.status < 300 ) || xhr.status == 304 || xhr.status == 1223 ||
 				jQuery.browser.safari && xhr.status == undefined;
 		} catch(e){}