HTTP(S) Proxy in Golang in less than 100 lines of code

The goal is to implement a proxy server for HTTP and HTTPS. Handling of HTTP is a matter of parsing request, passing such request to destination server, reading response and passing it back to the client. All we need for that is built-in HTTP server and client (net/http). HTTPS is different as it’ll use technique called HTTP CONNECT tunneling. First client sends request using HTTP CONNECT method t