Varnish, Squid or Nginx for caching proxy?

Question

Nginx

For the first time I come across such a thing as a caching proxy server and I would like to ask what software is best to use for this purpose?
The web server itself uses the nginx + php-fpm bundle .

Answer 1

It is logical that if you already have nginx installed and it is possible to configure caching in it, it is silly to install another program.