createFromException example

use Symfony\Component\HttpKernel\KernelEvents;

/** * Handle the EnforcedResponseException and deliver an EnforcedResponse. */
class EnforcedFormResponseSubscriber implements EventSubscriberInterface {

  /** * Replaces the response in case an EnforcedResponseException was thrown. */
  public function onKernelException(ExceptionEvent $event) {
    if ($response = EnforcedResponse::createFromException($event->getThrowable())) {
      // Setting the response stops the event propagation.       $event->setResponse($response);
    }
  }

  /** * Unwraps an enforced response. */
  public function onKernelResponse(ResponseEvent $event) {
    $response = $event->getResponse();
    if ($response instanceof EnforcedResponse && $event->isMainRequest()) {