Reverse Proxy - Website Called Thru Another Proxy

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http://serverfault.com – I am running perfectly running reverse proxy server for multiple domains, with 1 TB of RAM, 160 TB of HDD, fast as hell, running at this moment 364 websites, where pass thru data is around 1-5 GB per second. My question is this : I would like to use cache_peer directive to call the main IP address of the webserver, thru proxy server, i mean another proxy server, not reverse proxy server. It is the same principe, as you would use proxy server on your computer, connecting to webserver, which is running thru reverse proxy server. So in this scenario, it is actually : you ... proxy server ... w (HowTos)