anchor.diff:     * Shortcut method for PUT requests.  See [call] for a complete description
      * of parameters.
      */
  -  async.Future<HttpResponse> put(String url, String data, {
  +  async.Future<HttpResponse> put(String url, dynamic data, {
       Map<String, dynamic> params,
       Map<String, String> headers,
       bool withCredentials: false,
  
positive.code:    * of parameters.
     */
    async.Future<HttpResponse> jsonp(String url, {
      String data,
      Map<String, dynamic> params,
      Map<String, String> headers,
      bool withCredentials: false,
  
negative.code:    * of parameters.
     */
    async.Future<HttpResponse> delete(String url, {
      dynamic data,
      Map<String, dynamic> params,
      Map<String, String> headers,
      bool withCredentials: false,
  