15 line (but not durable) HTTP load balancer with NodeJS

gistfile1.js

var http = require('http');
var request = require('request');

var addrs = [
  'http://127.0.0.1:3000',
  'http://127.0.0.1:3001'
];
var index = 0;

http.createServer(function(req, res) {
  var proxied = request({ url: addrs[index] + req.url, followRedirect: false });
  req.pipe(proxied);
  proxied.pipe(res);
  index = (index + 1) % 2;
}).listen(8080);