code: public function downloadAction($type, $identifier)
      {
          $m = __METHOD__.' is deprecated, consider using the '.FileDownloadAction::class.' action/service instead';
          @trigger_error($m, E_USER_DEPRECATED);
  
          return $this->get(FileDownloadAction::class)->__invoke($type, $identifier);
      }
docs: @param string     $type
  @param string|int $identifier
  
  @throws \Exception
  
  @return Response