code: protected void send(Map<String, String> formParameters, ResponseListener listener) {
  
          RequestBody body = formBuilder(formParameters);
          sendRequest(null, listener, body);
      }
docs: Send this resource request asynchronously, with the given form parameters as the request body.
  If the Content-Type header was not previously set, this method will set it to "application/x-www-form-urlencoded".
  
  @param formParameters    The form parameters to put in the request body
  @param listener          The listener whose onSuccess or onFailure methods will be called when this request finishes