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    <h3>Editing: ServiceUnavailableHttpException.php</h3>
    <textarea name="content" rows="20" cols="80">&lt;?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier &lt;fabien@symfony.com&gt;
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\HttpKernel\Exception;

/**
 * @author Ben Ramsey &lt;ben@benramsey.com&gt;
 */
class ServiceUnavailableHttpException extends HttpException
{
    /**
     * @param int|string|null $retryAfter The number of seconds or HTTP-date after which the request may be retried
     * @param string|null     $message    The internal exception message
     * @param \Throwable|null $previous   The previous exception
     * @param int|null        $code       The internal exception code
     */
    public function __construct($retryAfter = null, ?string $message = '', ?\Throwable $previous = null, ?int $code = 0, array $headers = [])
    {
        if (null === $message) {
            trigger_deprecation('symfony/http-kernel', '5.3', 'Passing null as $message to &quot;%s()&quot; is deprecated, pass an empty string instead.', __METHOD__);

            $message = '';
        }
        if (null === $code) {
            trigger_deprecation('symfony/http-kernel', '5.3', 'Passing null as $code to &quot;%s()&quot; is deprecated, pass 0 instead.', __METHOD__);

            $code = 0;
        }

        if ($retryAfter) {
            $headers['Retry-After'] = $retryAfter;
        }

        parent::__construct(503, $message, $previous, $headers, $code);
    }
}
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