Connect to a heroku server with socket.io

How would one go about connecting to a heroku node.js server? For example, I have a server named 'https://example.herokuapp.com/' that uses node.js. How would I connect to it from a normal javascript file running socket.io. The code might look something like this:

var socket = io();
socket.connect('https://example.herokuapp.com/', { autoConnect: true});

I have tried this and I get the output of

polling-xhr.js:261 GET http://file/socket.io/?EIO=3&transport=polling&t=LjFlRl1 net::ERR_NAME_NOT_RESOLVED

So would I need an IP for the heroku server? If so how do I get it and is it even possible with heroku. If you're wondering why I don't host the html file on heroku it's because I'm using it for a website and my web host doesn't support node.js hosting. So I decided to host the node.js server on heroku. Thanks for your help in advance.

via McMatt