Aerys\Server::sendPreAppServiceUnavailableResponse PHP Method

    private function sendPreAppServiceUnavailableResponse(Request $request, Response $response)
    {
        $status = HTTP_STATUS["SERVICE_UNAVAILABLE"];
        $body = makeGenericBody($status);
        $response->setStatus($status);
        $response->setHeader("Connection", "close");
        $response->end($body);
    }