Not able to access node server on heroku

Question

I have a very basic node.js based http server that I want to use as a proxy. I setup the hostname and port in my system wide proxy settings for all http requests to make sure all the http requests go to this server.

The problem is - When I run the server locally, using foreman start and set localhost as hostname and 5000 as port, all my http requests are captured by this server. But when I deploy to Heroku, and using that host name and their port my page doesn't load.

Here is the code for the http server

var my_http = require("http");

var url = require('url');
var port = Number(process.env.PORT || 8080);

my_http.createServer(function(request, response) {
    var url_parts = url.parse(request.url, true);

    response.writeHeader(200, {
        "Content-Type": "text/plain"
    });
    response.write(request.method + ": " + port + ': ' + url_parts.href);
    response.end();
}).listen(port);

console.log("Server Running on " + port);

Note Foreman runs the application on port 5000 locally and runs on port 23536 on heroku.

My understanding of the problem We have a website traffic filter in the company that doesn't allow us to access most of the websites, directly. You need to click on a link (saying continue) every time you access a them. My understanding is that since I am trying to access those blocked websites, they are getting blocked or something (Though the request is proxied)?