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typo3/sysext/frontend/Classes/Middleware/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;
+
+/**
+ * Send content-length header.
+ * Notice that all HTML content outside the length of the content-length header will be cut off!
+ * Therefore content of unknown length from included PHP-scripts and if admin users are logged
+ * in (admin panel might show...) or if debug mode is turned on, we disable it!
+ *
+ * @internal
+ */
+class ContentLengthResponseHeader implements MiddlewareInterface
+{
+
+    /**
+     * Adds the content length
+     *
+     * @param ServerRequestInterface $request
+     * @param RequestHandlerInterface $handler
+     * @return ResponseInterface
+     */
+    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;
+    }
+}