simple node proxy using http-proxy

app.js

var app, routingProxy, apiProxy, proxyHost, proxyPort;
var express = require("express"),
	httpProxy = require("http-proxy"),
	fs = require("fs");

// Should we dynamically define these by environment?
proxyHost = "localhost";
proxyPort = "8080";

// Create and define the Express server
app = express();

// Configure a proxy to route requests that come to this Express server
// to a separate server defined by the host:port
routingProxy = new httpProxy.RoutingProxy();
// The apiProxy is created as middleware to be run within Express'
// middleware chain
apiProxy = function(pattern, host, port) {
	return function(req, res, next) {
		if (req.url.match(pattern)) {
			routingProxy.proxyRequest(req, res, {
				host: host,
				port: port
			});
		} else {
			return next();
		}
	};
};

// Configure the middleware for Express
app.configure(function() {
	app.set("port", 3000);
	app.set("views", __dirname + "/views");
	app.engine('html', require('ejs').renderFile);
	// use our proxy BEFORE Express' body parser to avoid hangs on POST
	app.use(apiProxy(/\/api\/.*/, proxyHost, proxyPort));
	app.use(express.bodyParser());
	// pull in all the controllers
	fs.readdirSync("controllers").forEach(function(controllerName) {
		require("./controllers/" + controllerName)(app);
	});
	app.use(app.router);
	app.use("/assets", express.static(__dirname + "/public"));
});

app.configure("development", function() {
	app.use(express.errorHandler());
});

module.exports = app;