anchor.diff:               transformRequest: transformRequest, transformResponse: transformResponse,
                cache: cache, timeout: timeout);
   
  +  /**
  +   * Shortcut method for JSONP requests.  See [call] for a complete description
  +   * of parameters.
  +   */
     async.Future<HttpResponse> jsonp(String url, {
       String data,
       Map<String, dynamic> params,
  
positive.code:         cache: cache).then((HttpResponse xhr) => xhr.responseText);
    }
  
    async.Future<HttpResponse> call({
      String url,
      String method,
  
negative.code:              transformRequest: transformRequest, transformResponse: transformResponse,
               cache: cache, timeout: timeout);
  
    /**
     * Shortcut method for HEAD requests.  See [call] for a complete description
     * of parameters.
     */
    async.Future<HttpResponse> head(String url, {
      String data,
      Map<String, dynamic> params,
  