EnforcedFormResponseSubscriber::onKernelException

public EnforcedFormResponseSubscriber::onKernelException(GetResponseForExceptionEvent $event)

public function onKernelException(GetResponseForExceptionEvent $event) {
  if ($response = EnforcedResponse::createFromException($event->getException())) {
    // Setting the response stops the event propagation.
    $event->setResponse($response);
  }
}