Deploying Flask with Heroku

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In my Flask app hosted on Heroku, I use this code to start the server:

if __name__ == '__main__':
    # Bind to PORT if defined, otherwise default to 5000.
    port = int(os.environ.get('PORT', 5000))
    app.run(host="0.0.0.0", port=port)

When developing locally, this will use port 5000, in production Heroku will set the PORT environment variable.

(Side note: By default, Flask is only accessible from your own computer, not from any other in the network (see the Quickstart). Setting host="0.0.0.0" will make Flask available from the network)

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