TechEmpower.FrameworkBenchmarks/frameworks/PHP/spiral/app/config/http.php

<?php
/**
 * Spiral Framework.
 *
 * @license   MIT
 * @author    Anton Titov (Wolfy-J)
 */
declare(strict_types=1);

return [
    'headers' => [
        'Server'       => 'Spiral',
        'Content-Type' => 'text/html; charset=UTF-8'
    ],
];