WSGI - bobbae/gcp GitHub Wiki

A Web Server Gateway Interface (WSGI) server implements the web server side of the WSGI interface for running Python web applications.

https://www.fullstackpython.com/wsgi-servers.html

Serving flask app with gunicorn and nginx

https://www.digitalocean.com/community/tutorials/how-to-serve-flask-applications-with-gunicorn-and-nginx-on-ubuntu-18-04