Heroku App crashes immediately with R10 and H10 errors

Question

My app runs fine locally using foreman run, and when I execute my runserver.py file using python runserver.py. When I push it to Heroku, it just cr

Answer 1

I found the answer to this issue...essentially I had to bind a port and specify the host that I am using:

In my runserver.py file I modified it using:

import os
from intro_to_flask import app

port = int(os.environ.get("PORT", 5000))
app.run(debug=True, host='0.0.0.0', port=port)

It's probably not the most elegant way of doing it.but it works.

Answer 2

You need to specify $PORT instead of ${PORT} like

web: python runserver.py $PORT

Answer 3

This link gives a simple example to start Flask app with Heroku