proxy.js

var httpProxy = require('http-proxy')
var proxy = httpProxy.createProxy();

var options = {
  'chyld.io': 'http://localhost:3001',
  'library.chyld.io': 'http://localhost:3002'
}

require('http').createServer(function(req, res) {

  try{
    proxy.web(req, res, {target: options[req.headers.host]}, function(e){});
  }catch(e){
  }

}).listen(3000);