Node HTTP Proxy with Express Server (same port)

proxy.js

// For cookies from proxied service to work, content and proxy must be served 
// from same address and port, and proxy port must be < 1024

var serviceSettings = {
	host:"<service-host>",
 	port:80
}

var serverSettings = {
 	port:98,
 	rootPath:"/public",
 	proxyPath:"/api" // e.g. http://localhost:98/api/GetUser maps to http://<service-host>/GetUser
}

var express = require('express'),
	app = express(),
	httpProxy = require('http-proxy');

var proxy = new httpProxy.HttpProxy({target: serviceSettings});

app.listen(serverSettings.port);
app.use(express.static(__dirname + serverSettings.rootPath));
app.all(serverSettings.proxyPath + '/*',function(request, response){

	// Remove the proxyPath from the query string
	request.url = '/' + request.url.split('/').slice(serverSettings.proxyPath.length - 2).join('/');
	
	if (request.method == 'OPTIONS') {
		response.setHeader('access-control-allow-origin', request.headers.origin);
		response.setHeader('access-control-allow-credentials', 'true');
		response.setHeader('access-control-allow-methods', request.method);
		response.setHeader('access-control-allow-headers', request.headers['access-control-request-headers']);
		response.writeHead(200);
		response.end();
	}
	else {
		response.setHeader('Access-Control-Allow-Origin', '*');
		response.setHeader('Access-Control-Allow-Methods', 'GET, OPTIONS, HEAD, POST, PUT, DELETE');
		response.setHeader('Access-Control-Allow-Headers', 'X-Requested-With');
		proxy.proxyRequest(request, response);
	}
});