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Manual:Squid caching/Simple config

How to configure Squid as a reverse proxy for a small wiki (only one server, a few web sites) ?

Apache runs on the port 81.

Here is my config for Squid (/etc/squid/squid.conf):

http_port 80 defaultsite=mysite.com vhost
cache_peer x.x.x.x parent 81 0 no-query originserver
acl apache rep_header Server ^Apache
broken_vary_encoding allow apache
cache_dir ufs /var/spool/squid 10000 16 256
cache_mem 256 MB
maximum_object_size_in_memory 32 KB
logformat common %>a %ui %un [%tl] "%rm %ru HTTP/%rv" %Hs %<st %Ss:%Sh
logformat combined %>a %ui %un [%tl] "%rm %ru HTTP/%rv" %Hs %<st "%{Referer}>h" "%{User-Agent}>h" %Ss:%Sh
access_log /var/log/squid/access.log squid
cache_log /var/log/squid/cache.log
cache_store_log /var/log/squid/store.log
hosts_file /etc/hosts
refresh_pattern ^ftp:           1440    20%     10080
refresh_pattern ^gopher:        1440    0%      1440
refresh_pattern .               0       20%     4320
acl all src 0.0.0.0/0.0.0.0
acl mydomain dstdomain mysite.com
acl myweb src x.x.x.x
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 81          # http
acl Safe_ports port 21          # ftp
acl Safe_ports port 443         # https
acl Safe_ports port 70          # gopher
acl Safe_ports port 280         # http-mgmt
acl Safe_ports port 488         # gss-http
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 allow purge myweb
http_access deny purge
http_access deny !Safe_ports
http_access allow localhost
http_access allow all
http_access allow mydomain
http_access deny all
http_reply_access allow all
icp_access allow all
cache_effective_group proxy
coredump_dir /var/spool/squid
forwarded_for on
emulate_httpd_log on
redirect_rewrites_host_header off
buffered_logs on