package main

import (

	"io"

	"log"

	"net/http"

	"strings"

)

func main() {

	localHost := "127.0.0.1.8001"

	targetHost := "127.0.0.1:80"

	httpsServer(localHost, targetHost)

	log.Fatalln("http server down!!!")

}

func httpsServer(addr string, remote_addr string) {

	http.HandleFunc("/", func(w http.ResponseWriter, req *http.Request) {

		cli := &http.Client{}

		body := make([]byte, 0)

		n, err := io.ReadFull(req.Body, body)

		if err != nil {

			io.WriteString(w, "Request Data Error")

			return

		}

		reqUrl := "http://" + remote_addr + req.URL.Path

		req2, err := http.NewRequest(req.Method, reqUrl, strings.NewReader(string(body)))

		if err != nil {

			io.WriteString(w, "Request Error")

			return

		}

		// set request content type

		contentType := req.Header.Get("Content-Type")

		req2.Header.Set("Content-Type", contentType)

		// request

		rep2, err := cli.Do(req2)

		if err != nil {

			io.WriteString(w, "Not Found!")

			return

		}

		defer rep2.Body.Close()

		n, err = io.ReadFull(rep2.Body, body)

		if err != nil {

			io.WriteString(w, "Request Error")

			return

		}

		// set response header

		for k, v := range rep2.Header {

			w.Header().Set(k, v[0])

		}

		io.WriteString(w, string(body[:n]))

	})

	var err error = nil

	err = http.ListenAndServe(":12307", nil)

	if err != nil {

		log.Fatal("server down!!!")

	}

}