Block access to all sites except one using Squid

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http://www.unix.com – I need a Squid config that allows access to only one domain: .example.com Traffic should only be allowed through if coming from and only port 80 (http) and port 443 (https) traffic should be allowed through, but again, only to this ONE domain. It Must be Squid (no iptables or other). Using Squid 3.1 on Centos 6 Thanks! (HowTos)