[mrweasel]

Varnish is just a proxy, or webcache, as I believe they like to call it. Nginx is needed because Varnish won't talk directly to the uwsgi processes, Varnish only understands http. The data that Varnish need to cache has to be supplied by a webserver somewhere and nginx is pretty nice and easily configurable. So I would assume that the idea is to use nginx as the webserver, not the cache/proxy.

[unbit]

you can directly link uWSGI with varnish using http protocol instead of the uwsgi one: http://projects.unbit.it/uwsgi/wiki/Example#varnish

[mrweasel]

I did not know that... That's pretty awesome.