偶发性出现 Connection refused

    $client = new Client([
            'base_uri' => $domain,
            'timeout'  => $timeout,
        ]);
        try {
            return $client->request($method, $url, $params)->getBody()->getContents();
        } catch (GuzzleException $e) {
            throw new Exception("HttpService接口调用失败 ".$e->getMessage());
        }