Run proxy server by nodejs on heroku

Hi i try to run nodejs based proxy server

https://github.com/tec27/node-argyle

just found that

var argyle = require('argyle');

var server = argyle(8080, '127.0.0.1');
server.on('connected', function(req, dest) {
    req.pipe(dest);
    dest.pipe(req);
});

this code works on local browser can connect and run

tried to push it heroku and run

procfile :

worker: node app.js

Package.json

 {
  "name": "proxy",
  "version": "1.0.0",
  "dependencies": {
    "argyle": "*"
  },
  "engines": {
    "node": "0.8.x",
    "npm": "1.1.x"
  }
}

do i miss anything or try to open specified ports @ heroku not allowed?