package main

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

func ReverseProxyHandler(w http.ResponseWriter, r *http.Request) {
	fmt.Println("receive a request from:", r.RemoteAddr, r.Header)

	target := "www.baidu.com"
	director := func(req *http.Request) {
		req.URL.Scheme = "https"
		req.URL.Host = target
		req.Host = target
	}
	proxy := &httputil.ReverseProxy{Director: director}
	proxy.ServeHTTP(w, r)
}

func main() {
	fmt.Printf("Starting server at port 8080\n")
	if err := http.ListenAndServe(":8080", http.HandlerFunc(ReverseProxyHandler)); err != nil {
		log.Fatal(err)
	}
}

package main

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

func ProxyHandler(w http.ResponseWriter, r *http.Request) {
	fmt.Printf("receive a request from {0}  {1}: \n", r.RemoteAddr, r.Header)
	if r.Host != "localhost:8080" {
		director := func(req *http.Request) {
			req.URL.Scheme = "http"
			req.URL.Host = r.Host
			req.Host = r.Host
		}
		proxy := &httputil.ReverseProxy{Director: director}
		proxy.ServeHTTP(w, r)
	} else {
		http.NotFound(w, r)
	}
}

func main() {
	if err := http.ListenAndServe(":8080", http.HandlerFunc(ProxyHandler)); err != nil {
		log.Fatal(err)
	}
}

//adding the proxy settings to the Transport object
	transport := &http.Transport{
		Proxy: http.ProxyURL(proxyURL),
	}

	//adding the Transport object to the http Client
	client := &http.Client{
		Transport: transport,
	}