src/Robots/AddDefaultRobotsOnKernelResponse.php line 20

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  1. <?php
  3. declare(strict_types=1);
  5. namespace App\Robots;
  7. use Symfony\Component\EventDispatcher\EventSubscriberInterface;
  8. use Symfony\Component\HttpKernel\Event\ResponseEvent;
  9. use Symfony\Component\HttpKernel\KernelEvents;
  11. class AddDefaultRobotsOnKernelResponse implements EventSubscriberInterface
  12. {
  13.     public static function getSubscribedEvents(): array
  14.     {
  15.         return [
  16.             KernelEvents::RESPONSE => ['onResponse', -1000],
  17.         ];
  18.     }
  20.     public function onResponse(ResponseEvent $event): void
  21.     {
  22.         if ($event->getRequest()->isXmlHttpRequest()) {
  23.             return;
  24.         }
  26.         $response = $event->getResponse();
  27.         if ($response->headers->has(Robots::ROBOT_HEADER_TAG)) {
  28.             return;
  29.         }
  31.         $response->headers->set(Robots::ROBOT_HEADER_TAG, Robots::ROBOTS_INDEX_FOLLOW->value);
  32.     }
  33. }