node.jsでhttpリクエストとwebsocket両方をreverse proxy

gistfile1.js

var http = require('http'),
    httpProxy = require('http-proxy');

// Proxy to rails app
var proxy1 = new httpProxy.HttpProxy({
  target: {
    host: 'localhost',
    port: 3000
  }
});

// Proxy to node.js
var proxy2 = new httpProxy.HttpProxy({
  target: {
    host: 'localhost',
    port: 8080
  }
});

var regex_socket_io = /^\/socket\.io\//;
var server = http.createServer(function (req, res) {
  if (req.url.match(regex_socket_io)) {
    proxy2.proxyRequest(req, res);
  } else {
  	proxy1.proxyRequest(req, res);
  }
});

server.on('upgrade', function(req, socket, head) {
  proxy2.proxyWebSocketRequest(req, socket, head);
});

server.listen(80);