Mine

http_port 3128 transparent

cache_dir aufs /var/spool/squid 600 16 256
visible_hostname squid_rayco

access_log /var/log/squid/access.log squid

httpd_accel_host virtual
httpd_accel_port 80
httpd_accel_with_proxy on
httpd_accel_uses_host_header on

acl all src 0.0.0.0/0.0.0.0
acl manager proto cache_object
acl localhost src 127.0.0.1/255.255.255.255
acl mired src 192.168.0.0/24

acl NOCACHE urlpath_regex -i cgi-bin \? \.gz$ \.bz2$

acl SSL_ports port 443
acl Safe_ports port 443

http_access allow mired
http_access allow localhost
http_access deny all

#nonhierarchical_direct off