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📄 AbstractSessionListener.php(7.68 KB)
📄 AbstractTestSessionListener.php(3.54 KB)
📄 AddRequestFormatsListener.php(1.2 KB)
📄 DebugHandlersListener.php(6.9 KB)
📄 DisallowRobotsIndexingListener.php(1.1 KB)
📄 DumpListener.php(1.72 KB)
📄 ErrorListener.php(5.24 KB)
📄 FragmentListener.php(2.84 KB)
📄 LocaleAwareListener.php(2.35 KB)
📄 LocaleListener.php(2.54 KB)
📄 ProfilerListener.php(3.97 KB)
📄 ResponseListener.php(1.3 KB)
📄 RouterListener.php(6.72 KB)
📄 SessionListener.php(1.53 KB)
📄 StreamedResponseListener.php(1.21 KB)
📄 SurrogateListener.php(1.75 KB)
📄 TestSessionListener.php(985 B)
📄 ValidateRequestListener.php(1.18 KB)

Editing: DisallowRobotsIndexingListener.php

<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\HttpKernel\EventListener;

use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\HttpKernel\Event\ResponseEvent;
use Symfony\Component\HttpKernel\KernelEvents;

/**
 * Ensures that the application is not indexed by search engines.
 *
 * @author Gary PEGEOT <garypegeot@gmail.com>
 */
class DisallowRobotsIndexingListener implements EventSubscriberInterface
{
    private const HEADER_NAME = 'X-Robots-Tag';

public function onResponse(ResponseEvent $event): void
    {
        if (!$event->getResponse()->headers->has(static::HEADER_NAME)) {
            $event->getResponse()->headers->set(static::HEADER_NAME, 'noindex');
        }
    }

/**
     * {@inheritdoc}
     */
    public static function getSubscribedEvents()
    {
        return [
            KernelEvents::RESPONSE => ['onResponse', -255],
        ];
    }
}

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