参考一下这个
https://forum.gtaos.com/index.php?threads/%E6%97%A0%E6%B3%95%E8%BF%9E%E6%8E%A5%E5%88%B0%E6%9C%8D%E5%8A%A1%E5%99%A8%E9%94%99%E8%AF%AF%E7%9A%84%E8%A7%A3%E5%86%B3%E6%96%B9%E6%A1%88failed-to-fetch-server-variables-curl-error-code-7.15/
如果你是云服务器,在安全组也得放行相应TCP和UDP端口