On Tue, 16 Nov 2004, Phil Endecott wrote:
I have a relatively slow CGI application that I'd like to accelerate by caching its output. So far I've tried Apache's mod_disk_cache and Squid (I'm using the Debian version of 2.5.7) and neither works, I believe because they both consider the CGI output to be uncacheable. I'm hoping that someone on this list can offer some advice about how or if Squid can be made to work in this scenario.
What does the cacheability check engine say about the results?
And make sure you have not explicitly denied caching by the no_cache directive. The recommended squid.conf for example does not cache URLs with a ? in them even if the server returns caching information.
Vary: Cookie Cache-Control: must-revalidate Etag: "hash-of-database-modification-time-and-any-cookie"
I expect the subsequent requests to include an If-None-Match header, and I will then send either a 200 response with a new Etag if the page has changed or a 304 response with the same Etag if it has not changed.
Squid-2.5 does not support ETag, unfortunately (only Vary). There is a patch at http://devel.squid-cache.org/ which adds ETag support to Squid-2.5.
The "must-revalidate" may also be a bit troublesome, and with "Vary: Cookie" it should not really be needed, should it?
Regards Henrik
