Hi,
I have squid setup as an accelerator to serve cgi stuff. The cgi is pretty
cpu intensive, takes about 20 seconds to process request, so, I have the
requests cached as much as possible.
Problem is when to purge the cached cgi results. The cgi does NOT have
last modified header.
1. is it possible, when doing the HEAD command on the CGI, have it return
the last mod date, but not execute the CPU intensive stuff.
a. Possible complication: the content length will be 0 when doing
HEAD. If the obj is already cached, then cached content length will be
differ from the HEAD content length.
2. Can squid refresh object based on the folloing algo:
if (not_cached){
retrive_it
mark it as fresh
set obj to expire in 7 days
return it
}
else if (is_fresh){
return it
}
else if (time_retrived > last_mod){
mark the object as fresh for another 7 days (request from the next
7 days won't bother doing last_mod check, assume it's fresh)
return it
}
thx,
mike
