simple golang http proxy

simple_proxy.go

package main

import (
	"fmt"
	"io"
	"net/http"
)

// A very simple http proxy

func main() {
	simpleProxyHandler := http.HandlerFunc(simpleProxyHandlerFunc)
	http.ListenAndServe(":8080", simpleProxyHandler)
}

func simpleProxyHandlerFunc(w http.ResponseWriter, r *http.Request) {
	httpc := &http.Client{}

	// request uri can't be set in client requests
	r.RequestURI = ""

	if r.Method == "CONNECT" {
		fmt.Println(r.URL, " CONNECT / SSL not implemented")
		return
	}

	fmt.Println(r.URL, r.Method)
	
	resp, err := httpc.Do(r)

	if err != nil {
		fmt.Println(r.URL, " ", err.Error())
		return
	}

	copyHeaders(w.Header(), resp.Header)
	// copy content
	io.Copy(w, resp.Body)
}

func copyHeaders(dest http.Header, source http.Header) {
	for header := range source {
		dest.Add(header, source.Get(header))
	}
}