Using Squid and Apache

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http://askubuntu.com – I've installed squid3 on my Ubuntu 12.04. I changed the http_port to 80. When I type in the "The requested URL could not be retrieved" from squid. Do I have to run Apache as my web server or squid has a web server itself to run the web files? I am a little bit confused here. I am asked to setup squid on top of apache but I can't find the way to integrate them. (HowTos)