Dead simple HTTP reverse proxy

http-reverse-proxy.go

// Thanks to: https://siberianlaika.ru/node/29/

package main

import (
	"fmt"
	"net/http"
	"net/http/httputil"
	"net/url"
	"os"
	"path/filepath"
	"time"
)

func main() {
	if len(os.Args) != 3 {
		fmt.Printf("Usage: %s <src> <dest>\n", filepath.Base(os.Args[0]))
		os.Exit(1)
	}
	src := os.Args[1]
	dest := os.Args[2]
	destURL, error := url.Parse(dest)
	if error != nil {
		fmt.Println("Invalid dest (see https://golang.org/pkg/net/url/#URL)")
		os.Exit(1)
	}
	proxy := httputil.NewSingleHostReverseProxy(destURL)
	server := &http.Server{
		Addr:           src,
		Handler:        proxy,
		ReadTimeout:    10 * time.Second,
		WriteTimeout:   10 * time.Second,
		MaxHeaderBytes: 1 << 20,
	}
	fmt.Printf("%s\n", server.ListenAndServe().Error())
}