Why does running the Flask dev server run itself twice?

Question

I\'m using Flask for developing a website and while in development I run flask using the following file:

#!/usr/bin/env python
from datetime import datetime
         


        

Answer 1

One of the possible reason why the Flask app run itself twice is a configuration of WEB_CONCURRENCY setting on Heroku. To set into one, you can write in console heroku config:set WEB_CONCURRENCY=1