app router via path with http-proxy

proxy.js

// I'm just being lazy and loading both apps here for simpliciy,
// but these would be started by themselves as their own
// servers somewhere else
require('./this-app');
require('./that-app');

// core node http lib for your proxy server
// you'd probably use the "https" module here, and add certs
// you could really use any http server for this, even express, but this
// is probably sufficient and simpler, since you won't be providing anything
// but forwarding requests from this server
var http = require('http');

// this modules provides a way to proxy the requests from our main server
var httpProxy = require('http-proxy');

// create our proxy handler we can send requests to
var proxy = httpProxy.createProxy();

// create our proxy server w/ core node http module
var proxyServer = http.createServer(function(req, res) {
    console.log('Incoming Url to proxy server: ', req.url);

    // route anything that starts with "/thisApp" to it's server
    if(/^\/thisApp/.test(req.url)) {
        console.log('routing %s to thisApp', req.url);

        // strip off the leading "/thisApp" from the url so it's
        // not visible to your app we forward to
        req.url = req.url.substring(8);

        // send the request along to thisApp's server
        return proxy.web(req, res, {
            target: 'http://localhost:3001'
        });
    }

    if(/^\/thatApp/.test(req.url)) {
        console.log('routing %s to thatApp', req.url);


        // strip off the leading "/thatApp" from the url so it's
        // not visible to your app we forward to
        req.url = req.url.substring(8);

        // send the request along to thatApp's server
        return proxy.web(req, res, {
            target: 'http://localhost:3002'
        });
    }

    // no matching "app" to proxy to
    res.statusCode = 404;
    res.end('i got nothin');

});

// you'd probably be listening on 80/443 here
proxyServer.listen(3000);

that-app.js

var express = require('express');

var thatApp = express();

thatApp.get('/', function(req, res) {
    res.send('thatApp is the best');
});

thatApp.listen(3002);

this-app.js

var express = require('express');

var thisApp = express();

thisApp.get('/', function(req, res) {
    res.send('thisApp is the best');
});

thisApp.listen(3001);