refactor($http) Simplify code by removing the createXhr() method

This removes a workaround for IE 8 and and error handling for IE6.

Author: realityking

docs/content/error/$httpBackend/noxhr.ngdoc

@@ -1,18 +1,6 @@
 'use strict';
 
-function createXhr(method) {
-    //if IE and the method is not RFC2616 compliant, or if XMLHttpRequest
-    //is not available, try getting an ActiveXObject. Otherwise, use XMLHttpRequest
-    //if it is available
-    if (msie <= 8 && (!method.match(/^(get|post|head|put|delete|options)$/i) ||
-      !window.XMLHttpRequest)) {
-      return new window.ActiveXObject("Microsoft.XMLHTTP");
-    } else if (window.XMLHttpRequest) {
-      return new window.XMLHttpRequest();
-    }
-
-    throw minErr('$httpBackend')('noxhr', "This browser does not support XMLHttpRequest.");
-}
+var XHR = window.XMLHttpRequest;
 
 /**
  * @ngdoc service
@@ -32,11 +20,11 @@ function createXhr(method) {
  */
 function $HttpBackendProvider() {
   this.$get = ['$browser', '$window', '$document', function($browser, $window, $document) {
-    return createHttpBackend($browser, createXhr, $browser.defer, $window.angular.callbacks, $document[0]);
+    return createHttpBackend($browser, XHR, $browser.defer, $window.angular.callbacks, $document[0]);
   }];
 }
 
-function createHttpBackend($browser, createXhr, $browserDefer, callbacks, rawDocument) {
+function createHttpBackend($browser, XHR, $browserDefer, callbacks, rawDocument) {
   var ABORTED = -1;
 
   // TODO(vojta): fix the signature
@@ -59,7 +47,7 @@ function createHttpBackend($browser, createXhr, $browserDefer, callbacks, rawDoc
       });
     } else {
 
-      var xhr = createXhr(method);
+      var xhr = new XHR;
 
       xhr.open(method, url, true);
       forEach(headers, function(value, key) {

src/ng/httpBackend.js

@@ -1620,10 +1620,6 @@ function MockHttpExpectation(method, url, data, headers) {
   };
 }
 
-function createMockXhr() {
-  return new MockXhr();
-}
-
 function MockXhr() {
 
   // hack for testing $http, $httpBackend

src/ngMock/angular-mocks.js

@@ -1,4 +1,4 @@
-/* global createHttpBackend: false, createMockXhr: false, MockXhr: false */
+/* global createHttpBackend: false, MockXhr: false */
 'use strict';
 
 describe('$httpBackend', function() {
@@ -57,7 +57,7 @@ describe('$httpBackend', function() {
         })
       }
     };
-    $backend = createHttpBackend($browser, createMockXhr, fakeTimeout, callbacks, fakeDocument);
+    $backend = createHttpBackend($browser, MockXhr, fakeTimeout, callbacks, fakeDocument);
     callback = jasmine.createSpy('done');
   }));
 
@@ -442,7 +442,7 @@ describe('$httpBackend', function() {
 
 
     it('should convert 0 to 200 if content and file protocol', function() {
-      $backend = createHttpBackend($browser, createMockXhr);
+      $backend = createHttpBackend($browser, MockXhr);
 
       $backend('GET', 'file:///whatever/index.html', null, callback);
       respond(0, 'SOME CONTENT');
@@ -452,7 +452,7 @@ describe('$httpBackend', function() {
     });
 
     it('should convert 0 to 200 if content for protocols other than file', function() {
-      $backend = createHttpBackend($browser, createMockXhr);
+      $backend = createHttpBackend($browser, MockXhr);
 
       $backend('GET', 'someProtocol:///whatever/index.html', null, callback);
       respond(0, 'SOME CONTENT');
@@ -462,7 +462,7 @@ describe('$httpBackend', function() {
     });
 
     it('should convert 0 to 404 if no content and file protocol', function() {
-      $backend = createHttpBackend($browser, createMockXhr);
+      $backend = createHttpBackend($browser, MockXhr);
 
       $backend('GET', 'file:///whatever/index.html', null, callback);
       respond(0, '');
@@ -472,7 +472,7 @@ describe('$httpBackend', function() {
     });
 
     it('should not convert 0 to 404 if no content for protocols other than file', function() {
-      $backend = createHttpBackend($browser, createMockXhr);
+      $backend = createHttpBackend($browser, MockXhr);
 
       $backend('GET', 'someProtocol:///whatever/index.html', null, callback);
       respond(0, '');
@@ -500,7 +500,7 @@ describe('$httpBackend', function() {
 
       try {
 
-        $backend = createHttpBackend($browser, createMockXhr);
+        $backend = createHttpBackend($browser, MockXhr);
 
         $backend('GET', '/whatever/index.html', null, callback);
         respond(0, '');
@@ -515,7 +515,7 @@ describe('$httpBackend', function() {
 
 
     it('should return original backend status code if different from 0', function () {
-      $backend = createHttpBackend($browser, createMockXhr);
+      $backend = createHttpBackend($browser, MockXhr);
 
       // request to http://
       $backend('POST', 'http://rest_api/create_whatever', null, callback);