nextcloud-server/core/Controller/WalledGardenController.php

<?php
/**
 * SPDX-FileCopyrightText: 2017 Nextcloud GmbH and Nextcloud contributors
 * SPDX-License-Identifier: AGPL-3.0-or-later
 */
namespace OC\Core\Controller;

use OCP\AppFramework\Controller;
use OCP\AppFramework\Http;
use OCP\AppFramework\Http\Attribute\FrontpageRoute;
use OCP\AppFramework\Http\Attribute\NoCSRFRequired;
use OCP\AppFramework\Http\Attribute\OpenAPI;
use OCP\AppFramework\Http\Attribute\PublicPage;
use OCP\AppFramework\Http\Response;

#[OpenAPI(scope: OpenAPI::SCOPE_IGNORE)]
class WalledGardenController extends Controller {
	#[PublicPage]
	#[NoCSRFRequired]
	#[FrontpageRoute(verb: 'GET', url: '/204')]
	public function get(): Response {
		$resp = new Response();
		$resp->setStatus(Http::STATUS_NO_CONTENT);
		return $resp;
	}
}