ContentLengthResponseHeader.php

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<?php
declare(strict_types = 1);
namespace ‪TYPO3\CMS\Frontend\Middleware;
 
/*
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */
 
use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\ServerRequestInterface;
use Psr\Http\Server\MiddlewareInterface;
use Psr\Http\Server\RequestHandlerInterface;
use ‪TYPO3\CMS\Core\Http\NullResponse;
use ‪TYPO3\CMS\Frontend\Controller\TypoScriptFrontendController;
 
class ‪ContentLengthResponseHeader implements MiddlewareInterface
{
 
    public function ‪process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface
    {
        $response = $handler->handle($request);
        if (
            !($response instanceof ‪NullResponse)
            && ‪$GLOBALS['TSFE'] instanceof ‪TypoScriptFrontendController
            && ‪$GLOBALS['TSFE']->isOutputting()) {
            if (
                    (!isset(‪$GLOBALS['TSFE']->config['config']['enableContentLengthHeader']) || ‪$GLOBALS['TSFE']->config['config']['enableContentLengthHeader'])
                    && !‪$GLOBALS['TSFE']->isBackendUserLoggedIn() && !‪$GLOBALS['TYPO3_CONF_VARS']['FE']['debug']
                    && !‪$GLOBALS['TSFE']->config['config']['debug'] && !‪$GLOBALS['TSFE']->doWorkspacePreview()
                ) {
                $response = $response->withHeader('Content-Length', (string)$response->getBody()->getSize());
            }
        }
        return $response;
    }
}