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服务提供者 链接 http/https IP Version
Google http://www.gstatic.com/generate_204 204/204 4+6
Google http://www.google-analytics.com/generate_204 204/204 4+6
Google http://www.google.com/generate_204 204/204 4+6
Google http://connectivitycheck.gstatic.com/generate_204 204/204 4+6
Apple http://captive.apple.com 200/200 4+6
Apple🔥 http://www.apple.com/library/test/success.html 200/200 4+6
MicroSoft http://www.msftconnecttest.com/connecttest.txt 200/error 4
Cloudflare http://cp.cloudflare.com/ 204/204 4+6
Firefox http://detectportal.firefox.com/success.txt 200/200 4+6
V2ex http://www.v2ex.com/generate_204 204/301 4+6
小米 http://connect.rom.miui.com/generate_204 204/204 4
华为 http://connectivitycheck.platform.hicloud.com/generate_204 204/204 4
Vivo http://wifi.vivo.com.cn/generate_204 204/204 4

http/https一列表示使用指定协议进行请求，返回的状态码。部分场合对状态码要求较严格。