ext_localconf.php

<?php
defined('TYPO3_MODE') or die();

/**
 * Copyright notice
 *
 * (c) Saxon State and University Library Dresden <typo3@slub-dresden.de>
 * All rights reserved
 *
 * This script is part of the TYPO3 project. The TYPO3 project is
 * free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * The GNU General Public License can be found at
 * http://www.gnu.org/copyleft/gpl.html.
 *
 * This script is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * This copyright notice MUST APPEAR in all copies of the script!
 */

// Register Extbase plugins
\TYPO3\CMS\Extbase\Utility\ExtensionUtility::configurePlugin(
    'Dfgviewer',
    'Uri',
    [
        \Slub\Dfgviewer\Controller\UriController::class => 'main'
    ],
    // non-cacheable actions
    [
    ]
);

\TYPO3\CMS\Extbase\Utility\ExtensionUtility::configurePlugin(
    'Dfgviewer',
    'Sru',
    [
        \Slub\Dfgviewer\Controller\SruController::class => 'main'
    ],
    // non-cacheable actions
    [
    ]
);