Deploying Flask app to Heroku
I haven't used Heroku, but to me, it looks like they have a reserved port for Flask, specifically 33507. It looks like it will try to use an environment variable, which I am not sure how to set in Heroku. The good news is you can tell Flask which port to use.
try this:
app.run(debug=True, port=33507)and it looks like adding the PORT to the env in heroku is done like this:
heroku config:add PORT=33507You should only have to do one of these. I would try the first as it, to me, is the straight forward way to fix the issue.
EDIT
After reading the article from your post, I see where the issue comes in.
port = int(os.environ.get('PORT', 5000))That line says, get the value of PORT from the environment if it is set, otherwise use 5000. I am not sure why they wouldn't allow it to run from 5000 if that's what is in their docs, but I would try this change:
port = int(os.environ.get('PORT', 33507))