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typo3/sysext/backend/Classes/Controller/DummyController.php

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+<?php
+namespace TYPO3\CMS\Backend\Controller;
+
+/*
+ * 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 TYPO3\CMS\Backend\Template\DocumentTemplate;
+use TYPO3\CMS\Core\Http\HtmlResponse;
+
+/**
+ * '/empty' routing target returns dummy content.
+ * @internal This class is a specific Backend controller implementation and is not considered part of the Public TYPO3 API.
+ */
+class DummyController
+{
+    /**
+     * Return simple dummy content
+     *
+     * @return ResponseInterface the response with the content
+     */
+    public function mainAction(): ResponseInterface
+    {
+        $documentTemplate = $this->getDocumentTemplate();
+        $content = $documentTemplate->startPage('Dummy document') . $documentTemplate->endPage();
+        return new HtmlResponse($content);
+    }
+
+    /**
+     * Returns an instance of DocumentTemplate
+     *
+     * @return DocumentTemplate
+     */
+    protected function getDocumentTemplate()
+    {
+        return $GLOBALS['TBE_TEMPLATE'];
+    }
+}