Ruby Webrickbuiltinhttpproxy代理服务器

refer to:
https://stackoverflow.com/questions/12187509/how-do-i-write-a-simple-https-proxy-server-in-ruby

https://ruby-doc.org/stdlib-2.5.0/libdoc/webrick/rdoc/WEBrick/HTTPProxyServer.html

webrick 已经是了。