Rewrite of the Ajax module by Julian Aubourg. Some (dated) details can be found here: http://oksoclap.com/6Y26bm1ZsB more details are forthcoming. Fixes #7195.

src/transports/script.js

@@ -0,0 +1,83 @@
+(function( jQuery ) {
+
+// Install text to script executor
+jQuery.extend( true, jQuery.ajaxSettings , {
+
+	accepts: {
+		script: "text/javascript, application/javascript"
+	},
+	
+	autoDataType: {
+		script: /javascript/
+	},
+		
+	dataConverters: {
+		"text => script": jQuery.globalEval
+	}
+} );
+
+// Bind script tag hack transport
+jQuery.xhr.bindTransport("script", function(s) {
+	
+	// Handle cache special case
+	if ( s.cache === undefined ) {
+		s.cache = false;
+	}
+	
+	// This transport only deals with cross domain get requests
+	if ( s.crossDomain && s.async && ( s.type === "GET" || ! s.data ) ) {
+		
+		s.global = false;
+		
+		var script,
+			head = document.getElementsByTagName("head")[0] || document.documentElement;
+		
+		return {
+			
+			send: function(_, callback) {
+
+				script = document.createElement("script");
+
+				script.async = "async";
+
+				if ( s.scriptCharset ) {
+					script.charset = s.scriptCharset;
+				}
+				
+				script.src = s.url;
+				
+				// Attach handlers for all browsers
+				script.onload = script.onreadystatechange = function(statusText) {
+					
+					if ( (!script.readyState ||
+							script.readyState === "loaded" || script.readyState === "complete") ) {
+								
+						// Handle memory leak in IE
+						script.onload = script.onreadystatechange = null;
+						
+						// Remove the script
+						if ( head && script.parentNode ) {
+							head.removeChild( script );
+						}
+						
+						script = undefined;
+						
+						// Callback & dereference
+						callback(statusText ? 0 : 200, statusText || "success");
+					}
+				};
+				// Use insertBefore instead of appendChild  to circumvent an IE6 bug.
+				// This arises when a base node is used (#2709 and #4378).
+				head.insertBefore( script, head.firstChild );
+			},
+			
+			abort: function(statusText) {
+				if ( script ) {
+					script.onload(statusText);
+				}
+			}
+		};
+	}
+});
+
+})(jQuery);