Can not Get Turn server from computeenginedemand for peer-to-peer video chat

I've deployed my video chat app on heroku after learning from your tutorials My app is requesting for the turn server put on computeenigneondemand.appspot.com. And the request is blocked due to cors. I've tried enabliong it using jquery, setting header at my server file. Nothing worked for me! I'm having this issue for 3 days and I cant fix it. Have a look at my main.js file. Thanks in advance