Flask App Won't Run On Heroku

It runs fine when I run it locally from Heroku. In the logs, the error I'm getting is a timeout error. from flask import Flask, render_template, request import requests import jso

Solution 1:

As the logs state:

Error R10 (Boot timeout) -> Web process failed to bind to $PORT within 60 seconds of launch

You are not binding to the provided PORT variable and so Heroku terminates your program. If you just want to play around with Heroku + Flask then simply change your __main__ line to:

if __name__ == '__main__':
    from os import environ
    app.run(debug=False, port=environ.get("PORT", 5000), processes=2)

If this needs to handle more than two concurrent connections you will probably want to see the section of Flask's docs on deploying into standard WSGI containers.