protected function other(Request $request, Response $response, Route $route)
    {
        $request;
        $response = $response->withStatus(500)
            ->withHeader('Content-Type', 'text/plain');
        $message = sprintf(
            'Route "%s" failed for rule "%s"',
            $route->name,
            $route->failedRule
        );
        $response->getBody()->write($message);
        return $response;
    }