CodeIgniter 4 PHP

<?php
// app/Config/Routes.php

use CodeIgniter\Router\RouteCollection;

/** @var RouteCollection $routes */
$routes->get('/', 'Home::index');

$routes->get('/pixel.gif', static fn () => service('response')
    ->setContentType('image/gif', '')
    ->setHeader('Cache-Control', 'no-store')
    ->setBody(base64_decode('R0lGODlhAQABAIAAAP///wAAACH5BAEAAAAALAAAAAABAAEAAAICRAEAOw==')));