Function createHttpBackend

test/3rdparty/angular-1.2.5.js:7855–7981

($browser, XHR, $browserDefer, callbacks, rawDocument)

}

function createHttpBackend($browser, XHR, $browserDefer, callbacks, rawDocument) {
  var ABORTED = -1;

  // TODO(vojta): fix the signature
  return function(method, url, post, callback, headers, timeout, withCredentials, responseType) {
    var status;
    $browser.$$incOutstandingRequestCount();
    url = url || $browser.url();

    if (lowercase(method) == 'jsonp') {
      var callbackId = '_' + (callbacks.counter++).toString(36);
      callbacks[callbackId] = function(data) {
        callbacks[callbackId].data = data;
      };

      var jsonpDone = jsonpReq(url.replace('JSON_CALLBACK', 'angular.callbacks.' + callbackId),
          function() {
        if (callbacks[callbackId].data) {
          completeRequest(callback, 200, callbacks[callbackId].data);
        } else {
          completeRequest(callback, status || -2);
        }
        delete callbacks[callbackId];
      });
    } else {
      var xhr = new XHR();
      xhr.open(method, url, true);
      forEach(headers, function(value, key) {
        if (isDefined(value)) {
            xhr.setRequestHeader(key, value);
        }
      });

      // In IE6 and 7, this might be called synchronously when xhr.send below is called and the
      // response is in the cache. the promise api will ensure that to the app code the api is
      // always async
      xhr.onreadystatechange = function() {
        if (xhr.readyState == 4) {
          var responseHeaders = null,
              response = null;

          if(status !== ABORTED) {
            responseHeaders = xhr.getAllResponseHeaders();
            response = xhr.responseType ? xhr.response : xhr.responseText;
          }

          // responseText is the old-school way of retrieving response (supported by IE8 & 9)
          // response/responseType properties were introduced in XHR Level2 spec (supported by IE10)
          completeRequest(callback,
              status || xhr.status,
              response,
              responseHeaders);
        }
      };

      if (withCredentials) {
        xhr.withCredentials = true;
      }