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    <h3>Editing: ValidateRequestListener.php</h3>
    <textarea name="content" rows="20" cols="80">&lt;?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier &lt;fabien@symfony.com&gt;
 *
 * 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\RequestEvent;
use Symfony\Component\HttpKernel\KernelEvents;

/**
 * Validates Requests.
 *
 * @author Magnus Nordlander &lt;magnus@fervo.se&gt;
 *
 * @final
 */
class ValidateRequestListener implements EventSubscriberInterface
{
    /**
     * Performs the validation.
     */
    public function onKernelRequest(RequestEvent $event)
    {
        if (!$event-&gt;isMainRequest()) {
            return;
        }
        $request = $event-&gt;getRequest();

        if ($request::getTrustedProxies()) {
            $request-&gt;getClientIps();
        }

        $request-&gt;getHost();
    }

    public static function getSubscribedEvents(): array
    {
        return [
            KernelEvents::REQUEST =&gt; [
                ['onKernelRequest', 256],
            ],
        ];
    }
}
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