$exception = new HTTPException\ServiceUnavailableException($reason);
- header($_SERVER["SERVER_PROTOCOL"] . ' ' . $exception->getCode() . ' ' . DI::l10n()->t('System down for maintenance'));
+ header($_SERVER['SERVER_PROTOCOL'] . ' ' . $exception->getCode() . ' ' . DI::l10n()->t('System down for maintenance'));
$tpl = Renderer::getMarkupTemplate('exception.tpl');