LaravelFCM\Response\BaseResponse::isJsonResponse PHP Method

    private function isJsonResponse(GuzzleResponse $response)
    {
        if ($response->getStatusCode() == 200) {
            return;
        }
        if ($response->getStatusCode() == 400) {
            throw new InvalidRequestException($response);
        }
        if ($response->getStatusCode() == 401) {
            throw new UnauthorizedRequestException($response);
        }
        throw new ServerResponseException($response);
    }