Proxying to a couch based on URL

gistfile1.js

var http = require('http'),
    httpProxy = require('http-proxy'),
    couch = {
      host: 'localhost',
      port: 5984
    };

var proxy = new httpProxy.HttpProxy({
  target: {host: couch.host, port: couch.port}
});

http.createServer(function (req, res) { 
  if (/couch\/(.*)/.test(req.url)) {
    req.url = req.url.replace('couch/', '');
    proxy.proxyRequest(req, res);
  }
  else {
    res.writeHead(200, {'Content-Type': 'text/plain'});
    res.end('Hello World\n');
  }
}).listen(8080);