lacking key instruction in deployment to heroku

The documentation only specifies

if __name__ == '__main__':
    app.run_server(debug=True)

However, this would cause problems on the deployment of the app to heroku, the correct code should include the heroku port variable

if __name__ == '__main__':
    app.run_server(debug=False, port=PORT)

are you using gunicorn? or the development server?

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