Session Variables are not retained in python flask

[Lakshmi Vairamani]

We have a Google Assistant based (google assistant + dialogflow) chatbot with python API for fulfillment. 

Local Setup:

In local machine with Python Flask API + ngork setup, we didn't face any issues with session variables.

Server Setup:

In Hostinger VPS (Ubuntu), we deployed the same code with Flask API + gunicorn + nginx. We observed that the session variables are getting reset very frequently.

Session Management:

We added the following code in Python for sessions to stay longer.

    app.permanent_session_lifetime = timedelta(minutes=10)

Would appreciate any help in sorting out this issue.