How do sessions work in Flask?

Flask will process one request per thread at the same time. If you have 2 processes with 4 threads each, that’s 8 concurrent requests. Flask doesn’t spawn or manage threads or processes.

Flask sessions in essence are used to remember information from one request to another when the user is navigating in your application . To achieve this, Flask Session will use cookies to persist this data, but, not only as plain text, it will use signed cookies to achieve this.19 Mar 2021

There is no way to clear session or anything. One must simply change the app. config[“SECRET_KEY”] and the contents in session dictionary will get erased.