今天找http代理的例子，一直没找到满意的，终于在github上找到一个，非常的精简，非常的入眼，记录一下。

package main

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

func main() {
    http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
        director := func(req *http.Request) {
            req = r
            req.URL.Scheme = "http"
            req.URL.Host = r.Host
        }
        proxy := &httputil.ReverseProxy{Director: director}
        proxy.ServeHTTP(w, r)
    })

    log.Fatal(http.ListenAndServe(":8888", nil))
}

出处：https://gist.github.com/montanaflynn/304aa58b188f036204af