code: @Deprecated
    protected void onFailure(AsyncRequest<D, RQ> asyncRequest, Throwable throwable) {
      for (AsyncRequest.Thunk thunk: asyncRequest.getThunks()) {
        thunk.callback.onFailure(throwable);
      }
    }
docs: Callback on failing to send the asyncRequest
  
  @deprecated Use {@link #onFailure(AsyncRequest, DispatchException)}