httpbinproxy.go

// example reverse proxy
package main

import (
	"fmt"
	"log"
	"net/http"
	"net/http/httputil"
)

func main() {
	log.Fatal(http.ListenAndServe(":8181", &httputil.ReverseProxy{
		Director: func(r *http.Request) {
			fmt.Printf("Proxying request for '%v' from: %v\n", r.URL.Path, r.RemoteAddr)

			r.URL.Scheme = "http"
			r.Host = "httpbin.org"
			r.URL.Host = "httpbin.org:80"
		},
	}))
}