proxy.js

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

var proxy = httpProxy.createProxyServer({});

var proxyOptions = {
    'host': 'http://127.0.0.1',
    'port': '3000'
};

var CLIENT_ID = process.env.CLIENT_ID || 'client_id';
var CLIENT_SECRET = process.env.CLIENT_SECRET || 'client_secret';

var COOKIE_SECRET = process.env.COOKIE_SECRET || 'cookie_secret';

app.use(cookieParser());

app.use('/*', function (req, res) {
    proxy.web(req, res, {
        target: proxyOptions.host + ':' + proxyOptions.port + req.baseUrl
    });
});

// Modify outgoing requests
proxy.on('proxyReq', function(proxyReq, req, res, options) {
    // proxyReq.setHeader('X-Special-Proxy-Header', 'foobar')
    // proxyReq.setHeader('Authorization', '');
});

// Modify incoming requests
proxy.on('proxyRes', function (proxyRes, req, res, options) {
    console.log('RAW Response from the target', JSON.stringify(proxyRes.headers, true, 2));
});

app.listen(9000);