Unset environment variables when running app on Production mode - using config from object method

[ArsHinMQ]

So, I created a Flask application and I used Flask-SocketIO is a part of it, it worked fine until I removed the debug=True under if __name__ == "__main__"
app.py:

from flask import Flask
from dotenv import load_dotenv, find_dotenv
from flask_socketio import SocketIO

from config import Config

load_dotenv(find_dotenv())

def create_app():
    app = Flask(__name__)
    app.config.from_object(Config)

    return app

app = create_app()
io = SocketIO(app, engineio_logger=True)

# Registered Blueprints and imported socket's events

if __name__ == "__main__":
    io.run(app)

Now it gave me 500 error:
RuntimeError: A secret key is required to use CSRF.
Am I missing something?
What is the best way to set Flask config variables when using Flask-SocketIO?

[miguelgrinberg]

This has nothing to do with Flask-SocketIO, that error is coming from another extension, possibly Flask-WTF. Have you considered doing what the error says? It's simple enough to add a secret key.

[ArsHinMQ]

I have a SECRET_KEY, in my .env file, and I get it in config.py file
config,py:

from os import getenv

class Config:
    # Flask requirements
    SECRET_KEY = getenv("SECRET_KEY")

and it works when I set debug=True
so I just thought it can be Flask-SocketIO.

[miguelgrinberg]

You have to debug this, because the error indicates that Flask does not have the secret key configured.