记录一些免费的实用API

http://ip-api.com/json
http://icanhazip.com/  
https://ifconfig.co/json  (有CF)
https://api6.ipify.org/?format=json

https://api.postcodes.io/

测试浏览器 https://clienttest.ssllabs.com:8443/ssltest/viewMyClient.html
测试网站 https://www.ssllabs.com/ssltest/analyze.html?d=houyunbo.com

https://mybrowseraddon.com/