ResponseListener.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;

/**
 * ResponseListener fixes the Response headers based on the Request.
 *
 * @author Fabien Potencier <fabien@symfony.com>
 *
 * @final
 */
class ResponseListener implements EventSubscriberInterface {
    public function __construct(string $charset, bool $addContentLanguageHeader = false) {
    }
    
    /**
     * Filters the Response.
     */
    public function onKernelResponse(ResponseEvent $event) : void {
        if (!$event->isMainRequest()) {
            return;
        }
        $response = $event->getResponse();
        if (null === $response->getCharset()) {
            $response->setCharset($this->charset);
        }
        if ($this->addContentLanguageHeader && !$response->isInformational() && !$response->isEmpty() && !$response->headers
            ->has('Content-Language')) {
            $response->headers
                ->set('Content-Language', $event->getRequest()
                ->getLocale());
        }
        if ($event->getRequest()->attributes
            ->get('_vary_by_language')) {
            $response->setVary('Accept-Language', false);
        }
        $response->prepare($event->getRequest());
    }
    public static function getSubscribedEvents() : array {
        return [
            KernelEvents::RESPONSE => 'onKernelResponse',
        ];
    }

}