Nginx+Varnish compared to Nginx

[ Thanks to Guillermo Garron for this link. ]

Nginx is a fast and light webserver
when serving static files, it can also act as a HTTP accelerator, a
job that it performs well, and even features a cache.

Varnish is a HTTP accelerator, to work in
front of any webserver, including Nginx, but in that case how it
compare to Nginx working alone?

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