As far as I know, WSGI is a interface for web server and python web application to communicate each other.
One thing that I'm curious about is whether Nginx can be WSGI compatible.
If it can, it doesn't seem necessary to use intermediate WSGI server between Nginx and python web application requiring additional HTTP request(or maybe UNIX socket).
I just want to use only Nginx and Flask application without Werkzeug's builtin development server.