Does there exist any library that can serve a WSGI application as a FastCGI server, for Python 3? (So that nginx could then proxy requests to it?)
The Python 3 docs ment
I am aware of two options
Both support Python 3 and both can create WSGI workers based on other web app code and can be served to NGINX.
As Graham Dumpleton mentioned, CherryPy talks to NGINX via HTTP protocol, while uWSGI talks the 'uwsgi' protocol to nginx instead of the HTTP protocol, although it does also support using HTTP as well. On the application side, both support hosting Python web applications via the WSGI API.