raw-tcp-server.js

var net = require('net');

var server = net.Server();
var port = process.env.PORT || 1337;

server.listen(port);
server.on('connection', function (socket) {
  socket.write('hello');
});

console.log("listening on: " + port);


// used many different combinations to connect, but basically:
// telnet node-chat-server-bla.herokuapp.com 80

// tried the actual port the server started (by checking "heroku logs") as well