<?phpdeclare(strict_types=1);namespace App\EventListener;use Symfony\Component\HttpKernel\Event\ResponseEvent;class ResponseListener{ public function __construct(private readonly string $version) { } public function onKernelResponse(ResponseEvent $response): void { if (!$response->isMainRequest()) { return; } $response->getResponse()->headers->set('X-Version', $this->version); }}