http://www.cip.cc/">1 http://www.cip.cc/http://ping.chinaz.com/">2 http://ping.chinaz.com/https://httpbin.org/ip">3 https://httpbin.org/ip 1 http://www.cip.cc/命令行 2 http://ping.chinaz.com/ 3 https://httpbin.org/ip可用于检测是否使用代理
