feat($httpBackend): fix 0 status code when "file" protocol

Browsers return always 0 status code for "file" protocol, so we convert them into 200/404.

Author: vojtajina

src/service/httpBackend.js

@@ -17,19 +17,14 @@ var XHR = window.XMLHttpRequest || function() {
  */
 function $HttpBackendProvider() {
   this.$get = ['$browser', '$window', '$document', function($browser, $window, $document) {
-    return createHttpBackend($browser, XHR, $browser.defer, $window, $document[0].body);
+    return createHttpBackend($browser, XHR, $browser.defer, $window, $document[0].body,
+        $window.location.href.replace(':', ''));
   }];
 }
 
-function createHttpBackend($browser, XHR, $browserDefer, $window, body) {
+function createHttpBackend($browser, XHR, $browserDefer, $window, body, locationProtocol) {
   var idCounter = 0;
 
-  function completeRequest(callback, status, response) {
-    // normalize IE bug (http://bugs.jquery.com/ticket/1450)
-    callback(status == 1223 ? 204 : status, response);
-    $browser.$$completeOutstandingRequest(noop);
-  }
-
   // TODO(vojta): fix the signature
   return function(method, url, post, callback, headers, timeout) {
     $browser.$$incOutstandingRequestCount();
@@ -81,6 +76,20 @@ function createHttpBackend($browser, XHR, $browserDefer, $window, body) {
 
       return xhr;
     }
+
+    function completeRequest(callback, status, response) {
+      // URL_MATCH is defined in src/service/location.js
+      var protocol = (url.match(URL_MATCH) || ['', locationProtocol])[1];
+
+      // fix status code for file protocol (it's always 0)
+      status = protocol == 'file' ? (response ? 200 : 404) : status;
+
+      // normalize IE bug (http://bugs.jquery.com/ticket/1450)
+      status = status == 1223 ? 204 : status;
+
+      callback(status, response);
+      $browser.$$completeOutstandingRequest(noop);
+    }
   };
 }
 

test/service/httpBackendSpec.js

@@ -175,5 +175,60 @@ describe('$httpBackend', function() {
     // TODO(vojta): test whether it fires "async-start"
     // TODO(vojta): test whether it fires "async-end" on both success and error
   });
+
+  describe('file protocol', function() {
+
+    function respond(status, content) {
+      xhr = MockXhr.$$lastInstance;
+      xhr.status = status;
+      xhr.responseText = content;
+      xhr.readyState = 4;
+      xhr.onreadystatechange();
+    }
+
+
+    it('should convert 0 to 200 if content', function() {
+      $backend = createHttpBackend($browser, MockXhr, null, null, null, 'http');
+
+      $backend('GET', 'file:///whatever/index.html', null, callback);
+      respond(0, 'SOME CONTENT');
+
+      expect(callback).toHaveBeenCalled();
+      expect(callback.mostRecentCall.args[0]).toBe(200);
+    });
+
+
+    it('should convert 0 to 200 if content - relative url', function() {
+      $backend = createHttpBackend($browser, MockXhr, null, null, null, 'file');
+
+      $backend('GET', '/whatever/index.html', null, callback);
+      respond(0, 'SOME CONTENT');
+
+      expect(callback).toHaveBeenCalled();
+      expect(callback.mostRecentCall.args[0]).toBe(200);
+    });
+
+
+    it('should convert 0 to 404 if no content', function() {
+      $backend = createHttpBackend($browser, MockXhr, null, null, null, 'http');
+
+      $backend('GET', 'file:///whatever/index.html', null, callback);
+      respond(0, '');
+
+      expect(callback).toHaveBeenCalled();
+      expect(callback.mostRecentCall.args[0]).toBe(404);
+    });
+
+
+    it('should convert 0 to 200 if content - relative url', function() {
+      $backend = createHttpBackend($browser, MockXhr, null, null, null, 'file');
+
+      $backend('GET', '/whatever/index.html', null, callback);
+      respond(0, '');
+
+      expect(callback).toHaveBeenCalled();
+      expect(callback.mostRecentCall.args[0]).toBe(404);
+    });
+  });
 });