Squid.conf

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 to_localhost dst 127.0.0.0/8 acl SSL_ports port 443         # https acl SSL_ports port 563         # snews acl SSL_ports port 873         # rsync acl Safe_ports port 80         # http acl Safe_ports port 21         # ftp acl Safe_ports port 443        # https acl Safe_ports port 70         # gopher acl Safe_ports port 210        # wais acl Safe_ports port 1025-65535 # unregistered ports acl Safe_ports port 280        # http-mgmt acl Safe_ports port 488        # gss-http acl Safe_ports port 591        # filemaker acl Safe_ports port 777        # multiling http acl Safe_ports port 631        # cups acl Safe_ports port 873        # rsync acl Safe_ports port 901        # SWAT acl purge method PURGE acl CONNECT method CONNECT http_access allow manager localhost http_access deny manager http_access allow purge localhost http_access deny purge http_access deny !Safe_ports http_access deny CONNECT !SSL_ports http_access allow localhost http_access deny all icp_access allow all http_port 127.0.0.1:3128 vhost vport

cache_peer osgrid.org parent 8003 0 originserver default hierarchy_stoplist cgi-bin ? cache_dir ufs /var/spool/squid 1024 16 256 access_log /var/log/squid/access.log squid acl QUERY urlpath_regex cgi-bin \? cache deny QUERY refresh_pattern ^ftp:          1440    20%     10080 refresh_pattern ^gopher:       1440    0%      1440
 * 1) this is configured for osgrid on port 8003, change to your grid asset server.

refresh_pattern. 100000 20%     100800 override-expire acl apache rep_header Server ^Apache broken_vary_encoding allow apache extension_methods REPORT MERGE MKACTIVITY CHECKOUT hosts_file /etc/hosts coredump_dir /var/spool/squid
 * 1) the next line gives you about a week in cache before expiration. Change 100000 and 100800 to however long you want.