server.js

#!/usr/bin/env node

"use strict";

var http = require('http');
var https = require('https');
var util = require('util');
var proxy = require('./proxy');
var explorer = require('./explorer');

var Proxy = proxy.Proxy;
var Transform = proxy.Transform;

var PORT = process.env.REVIEWOMATIC_EXPLORE_PORT || process.env.PORT || 3023;

http.createServer(function (req, res) {
	var ip = req.connection.remoteAddress;
	var upstreamProxy;
	var path;

	var info = {
		title: req.headers['x-explore-title'] || "DirectGov",
		upstream: req.headers['x-explore-upstream'] || 'www.direct.gov.uk',
		upstream_protocol: req.headers['x-explore-upstream-protocol'] || 'http',
		redirector: req.headers['x-explore-redirector'] || "www-direct-gov-uk.redirector.preview.alphagov.co.uk"
	};

	util.log(req.method + " " + info.upstream + " " + req.url);

	if (req.url.match(/^\/__\//)) {
		// explorer single-page application and API
		path = req.url.replace(/^\/__/, "");
		explorer.request(req, res, path, info);
	} else {
		// upstream host presented on left-hand-side
		upstreamProxy = new Proxy(info.upstream, true);
		upstreamProxy.request(req, res);
	}

}).listen(PORT);

console.log('Proxy started: point your browser at http://localhost:' + PORT + '/__/');