public DefaultExceptionHtmlSubscriber::on404(GetResponseForExceptionEvent $event)
Handles a 404 error for HTML.
\Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent $event: The event to process.
public function on404(GetResponseForExceptionEvent $event) { $this->makeSubrequest($event, '/system/404', Response::HTTP_NOT_FOUND); }
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!EventSubscriber!DefaultExceptionHtmlSubscriber.php/function/DefaultExceptionHtmlSubscriber::on404/8.1.x