nextcloud-apps/files_reader/appinfo/routes.php

<?php

/**
 * ownCloud - Files_Reader App
 *
 * @author Frank de Lange
 * @copyright 2015 Frank de Lange
 *
 * This file is licensed under the Affero General Public License version 3 or
 * later.
 */

namespace OCA\Files_Reader\AppInfo;

return ['routes' => [
        ['name' => 'display#showReader', 'url' => '/', 'verb' => 'GET'],
]];