heroku webapp displays error, says "Cannot GET /"

Question

I have been following the webhook setup on Facebook Developer: https://developers.facebook.com/docs/messenger-platform/getting-started/webhook-setup

I have been deploying my index.js file on a heroku server and all it says is error, cannot get (reference link here)... error on application server

Other than my unique token I have not changed anything and in fact the heroku logs show that the events are being registered (reference link here) heroku logs

Would really appreciate some help on understanding how I can get rid of this error webpage so I can use this app link as my callback URL for messenger chatbot.

Answer 1

you need to add a route pointing to '/' in your app

app.get('/', (request, response) => {
return response.send('Ping!');
});