Deployed on Heroku, what's next?

Hi xVir,

Thank you for the repo. I deployed it on the Heroku and set the fulfillment URL as well. But when I go to the heroku URL, it throws me 'Not Found' error and in dialogflow console, it does not give the response too. Alos, I believe it is a web app but what if I were to use only webhooks to do simple math and fetch data.

