Node server for Backbone app with push state and redirects to Rails-API

server.js

// Server to foreward ajax requests
// http://stackoverflow.com/questions/7559862/proxy-with-nodejs-and-express/20539239#20539239
// http://stackoverflow.com/questions/10435407/proxy-with-express-js

var express = require('express'),
    request = require('request'),
    path = require('path'),
    app = express(),
    cson = require('cson'),
    modRewrite = require('connect-modrewrite'),
    configPath  = "./app/config/environments/web.cson";

var config = cson.parseFileSync(configPath);

var API_PROTOCOL  = 'http';
var API_SUBDOMAIN = 'demo';
var API_DOMAIN    = 'staffomatic-api.dev';
var API_VERSION   = 'V3';

var apiUrl = function(req){
  var subdomain = req.headers.host.split('.')[0];
  var url       = API_PROTOCOL + '://' + subdomain + "." + API_DOMAIN;
  var withPath  = url + req.originalUrl
  return withPath;
}

// url's which should be redirected to the API
var redirectRegex = /\/api|\/system|api\/v3\/oauth/
app.use(function(req, res, next){
  console.log('%s %s', req.method, req.url);
  var match = req.originalUrl.match(redirectRegex);
  if (!!match && match.length) {
    var url = apiUrl(req);
    req.pipe(request(url)).pipe(res);
  }else{
    next();
  }
});

app.use(modRewrite([
  '!\\.html|\\.jpg|\\.js|\\.css|\\.png|\\.svg|\\.eot|\\.ttf|\\.woff /index.html [L]'
]));

app.use(express.static(path.join(__dirname, 'public')));

var server = app.listen(3000, function() {
console.log('server listening @ http://localhost:%d', server.address().port);
console.log('\nNode and POW setup:');
console.log("make sure you use POW and add a port redirect \
see http://differential.io/blog/serve-ruby-on-rails-php-and-node-with-pow-pow#node for an example configuration\
should as simple as: cat ~/.pow/staffomatic-frontend => 3000");
});