What does the community think of this caching scheme (based on Tom's suggestion):
ad_proc cache_control {conn why} {
Control cacheing of images, static and dynamic pages.
} {
set url [string tolower [ad_conn url]]
switch -regexp $url {
.gif$ -
.jpe?g$ -
.png$ {
# Expire images after an hour.
set seconds [expr 60 * 60]
ns_set update [ad_conn outputheaders] Expires \
[ns_httptime [expr $seconds + [ns_time]]]
ns_set update [ad_conn outputheaders] Cache-Control \
"max-age=$seconds"
}
.css$ -
.html?$ {
# Expire static pages after half an hour.
set seconds [expr 30 * 60]
ns_set update [ad_conn outputheaders] Expires \
[ns_httptime [expr $seconds + [ns_time]]]
ns_set update [ad_conn outputheaders] Cache-Control \
"max-age=$seconds"
}
default {
# Expire all other pages immediately.
ns_set update [ad_conn outputheaders] Expires \
[ns_httptime [ns_time]]
ns_set update [ad_conn outputheaders] Cache-Control \
"no-cache,no-store,must-revalidate,proxy-revalidate"
ns_set update [ad_conn outputheaders] Pragma \
"no-cache"
}
}
return filter_ok
}
# Register the cache control proc.
ad_register_filter -critical f trace * /* cache_control
I've saved this as cache-control-init.tcl in the /tcl directory.
/Bart
