app.js

var url = require('url');
var querystring = require('querystring');
var express = require('express');
var Unblocker = require('unblocker');
var Transform = require('stream').Transform;
var youtube = require('unblocker/examples/youtube/youtube.js')

var app = express();

var google_analytics_id = process.env.GA_ID || null;

var unblocker = new Unblocker({
    prefix: '/proxy/',
    requestMiddleware: [
        youtube.processRequest
    ],
    responseMiddleware: [
        googleAnalyticsMiddleware
    ]
});

// this line must appear before any express.static calls (or anything else that sends responses)
app.use(unblocker);

// serve up static files *after* the proxy is run
app.use('/', express.static(__dirname + '/public'));

// this is for users who's form actually submitted due to JS being disabled or whatever
app.get("/no-js", function(req, res) {
    // grab the "url" parameter from the querystring
    var site = querystring.parse(url.parse(req.url).query).url;
    // and redirect the user to /proxy/url
    res.redirect(unblockerConfig.prefix + site);
});

const port = process.env.PORT || process.env.VCAP_APP_PORT || 8080;

app.listen(port, function() {
    console.log(`node unblocker process listening at http://localhost:${port}/`);
}).on("upgrade", unblocker.onUpgrade); // onUpgrade handles websockets