/**
  * Send the response content.
  *
  * Sets the composed ApiProblem's flag for including the stack trace in the
  * detail based on the display exceptions flag, and then sends content.
  *
  * @param SendResponseEvent $e
  *
  * @return self
  */
 public function sendContent(SendResponseEvent $e)
 {
     $response = $e->getResponse();
     if (!$response instanceof ApiProblemResponse) {
         return $this;
     }
     $response->getApiProblem()->setDetailIncludesStackTrace($this->displayExceptions());
     return parent::sendContent($e);
 }