Deploying Flask app to Heroku

Question

I\'m trying to develop my first \"large\" app with Flask on Heroku and I\'m attempting to combine the basic tutorial here: https://devcenter.heroku.com/articles/python with

Answer 1

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=33507

You 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))