proxy.go

package main

import (
  "flag"
  "log"
  "net/http"
  "net/url"
)

var (
  listen = flag.String("listen", "0.0.0.0:9000", "listen on address")
  logp = flag.Bool("log", false, "enable logging")
)

func main() {
  flag.Parse()
  proxyHandler := http.HandlerFunc(proxyHandlerFunc)
  log.Fatal(http.ListenAndServe(*listen, proxyHandler))
  log.Println("Started router-server on 0.0.0.0:9000")
}

func proxyHandlerFunc(w http.ResponseWriter, r *http.Request) {
  // Log if requested
  if *logp {
    log.Println(r.URL)
  }

  /* 
   * Tweak the request as appropriate:
   *   - RequestURI may not be sent to client
   *   - Set new URL
   */
  r.RequestURI = ""
  u, err := url.Parse("http://localhost:8080/")
  if err != nil {
    log.Fatal(err)
  }
  r.URL = u

  // And proxy
  // resp, err := client.Do(r)
  c := make(chan *http.Response)
  go doRequest(c)
  resp := <-c
  if resp != nil {
    resp.Write(w)
  }
}


func doRequest(c chan *http.Response) {
  // new client for every request.
  client := &http.Client{}

  resp, err := client.Get("http://127.0.0.1:8080/test")
  if err != nil {
    log.Println(err)
    c <- nil
  } else {
    c <- resp
  }
}

server.js

var http = require('http');
http.createServer(function (req, res) {
    // console.log("received request");
    res.writeHead(200, {'Content-Type': 'text/plain'});
      res.end('Hello World\n');
}).listen(8080, '127.0.0.1');
console.log('Server running at http://127.0.0.1:8080/');