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name : EsiListener.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\HttpKernel\Event\FilterResponseEvent;
use Symfony\Component\HttpKernel\KernelEvents;
use Symfony\Component\HttpKernel\HttpCache\Esi;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;

/**
 * EsiListener adds a Surrogate-Control HTTP header when the Response needs to be parsed for ESI.
 *
 * @author Fabien Potencier <fabien@symfony.com>
 */
class EsiListener implements EventSubscriberInterface
{
    private $esi;

    /**
     * Constructor.
     *
     * @param Esi $esi An ESI instance
     */
    public function __construct(Esi $esi = null)
    {
        $this->esi = $esi;
    }

    /**
     * Filters the Response.
     *
     * @param FilterResponseEvent $event A FilterResponseEvent instance
     */
    public function onKernelResponse(FilterResponseEvent $event)
    {
        if (!$event->isMasterRequest() || null === $this->esi) {
            return;
        }

        $this->esi->addSurrogateControl($event->getResponse());
    }

    public static function getSubscribedEvents()
    {
        return array(
            KernelEvents::RESPONSE => 'onKernelResponse',
        );
    }
}
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