Set request timeout response status

src/ng/httpBackend.js

@@ -108,9 +108,14 @@ function createHttpBackend($browser, createXhr, $browserDefer, callbacks, rawDoc
         completeRequest(callback, -1, null, null, '');
       };
 
+      var requestTimeout = function() {
+        // Set standard request timeout status code: 408
+        completeRequest(callback, 408, null, null, '');
+      };
+
       xhr.onerror = requestError;
       xhr.onabort = requestError;
-      xhr.ontimeout = requestError;
+      xhr.ontimeout = requestTimeout;
 
       forEach(eventHandlers, function(value, key) {
           xhr.addEventListener(key, value);

test/ng/httpBackendSpec.js

@@ -175,7 +175,7 @@ describe('$httpBackend', function() {
 
   it('should complete the request on timeout', function() {
     callback.and.callFake(function(status, response, headers, statusText) {
-      expect(status).toBe(-1);
+      expect(status).toBe(408);
       expect(response).toBe(null);
       expect(headers).toBe(null);
       expect(statusText).toBe('');