Symfony\Component\HttpFoundation\Response::setProtocolVersion PHP Method

    public function setProtocolVersion($version)
    {
        $this->version = $version;

        return $this;
    }

 public function handleKernelException(GetResponseForExceptionEvent $event)
 {
     if ($this->container->get('kernel')->getEnvironment() !== 'dev') {
         $exception = FlattenException::create($event->getException());
         // First, log the exception to the standard error logs.
         $this->container->get('logger')->error(' In File ' . $exception->getFile() . ', on line ' . $exception->getLine() . ': ' . $exception->getMessage());
         // Determine what the HTTP status code should be.
         if ($event->getException() instanceof \Symfony\Component\HttpKernel\Exception\HttpException) {
             $httpStatusCode = $event->getException()->getStatusCode();
         } else {
             $httpStatusCode = $exception->getCode();
             if ($exception->getCode() < 100 || $exception->getCode() >= 600) {
                 $httpStatusCode = 500;
             }
         }
         $parameters = ['status_code' => $httpStatusCode, 'status_text' => $exception->getMessage(), 'exception' => $exception];
         if (in_array('application/json', $event->getRequest()->getAcceptableContentTypes())) {
             $errorContent = $this->container->get('templating')->render(':default:exception.json.twig', $parameters);
         } else {
             $errorContent = $this->container->get('templating')->render(':default:error.html.twig', $parameters);
         }
         $response = new Response($errorContent, $httpStatusCode);
         $response->setProtocolVersion('1.1');
         $event->setResponse($response);
     }
 }