simple reverse proxy server

reverse_proxy.go

package main

import (
	"log"
	"strings"
	"net/url"
	"net/http"
	"net/http/httputil"
)

func main() {
	u, _ := url.Parse("http://127.0.0.1:9090")
	http.HandleFunc("/proxy", func(w http.ResponseWriter, r *http.Request) {
		r.RequestURI = strings.Join(strings.SplitAfter(r.RequestURI, "/proxy"), "")
		proxy := httputil.NewSingleHostReverseProxy(u)
		proxy.ServeHTTP(w, r)
	})
	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
		proxy := httputil.NewSingleHostReverseProxy(u)
		proxy.ServeHTTP(w, r)
	})
	err := http.ListenAndServe("127.0.0.1:80", nil)
	if err != nil {
		log.Fatal("ListenAndServe: ", err)
	}
}