Using node-http-proxy to proxy normal and WebSockets traffic (for Etherpad) but also having a redirect at the root to direct people to a particular pad.

node-http-proxy-with-redirects.js

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

// Create an instance of node-http-proxy
var proxy = new httpProxy.HttpProxy({
  target: {
    host: 'localhost',
    port: 9001
  }
});

// Proxy normal HTTP requests
var server = http.createServer(function (req, res) {
  // redirect root to specific pad
  if (req.url == ('/')) {
    res.writeHead(301, {'Location':'http://dc.opendataday.org/p/2013', 'Expires': (new Date).toGMTString()});
    res.end();
  } else {
    proxy.proxyRequest(req, res);
  }
});

// Proxy websocket requests too
server.on('upgrade', function(req, socket, head) {
  proxy.proxyWebSocketRequest(req, socket, head);
});

server.listen(80);