code: protected void send(Context context, Map<String, String> formParameters, ResponseListener listener) {
          setContext(context);
          super.send(formParameters, listener);
      }
docs: Send this resource request asynchronously, with the given form parameters as the request body.
  If no Content-Type header was set, this method will set it to "application/x-www-form-urlencoded".
  
  @param context           The context that will be passed to authentication listener.
  @param formParameters    The parameters to put in the request body
  @param listener          The listener whose onSuccess or onFailure methods will be called when this request finishes