protected function setResponseHeaders(Response $response)
 {
     parent::setResponseHeaders($response);
     $response->headers->set('X-Sendfile', $this->fullFilename);
 }
 protected function setResponseHeaders(Response $response)
 {
     parent::setResponseHeaders($response);
     $response->headers->set('Content-Length', filesize($this->fullFilename));
 }
 protected function setResponseHeaders(Response $response)
 {
     parent::setResponseHeaders($response);
     $response->headers->set('X-Accel-Redirect', $this->fullFilename);
 }