503 issue with implementation on Heroku

[peepsbill]

Your project is wonderful, and I was able to run the project on local host. When I moved to Heroku, I received 503, service unavailable error, when mainPage.js attempts const response = away (fetch(url.... I see console.log [send data], but [received data] is not reached.

I thought the issue might be related to .pem for SSL, but I understand that Heroku doesn't require that element. Any guidance would be greatly appreciated.