On Fri, 4 May 2001 16:04:06 +0200, Oliver Bleutgen <myzope@gmx.net> wrote:

...

Has anybody found a nice strategy to cleverly handle this kind of situation?

Two options:

PULL: scrounge modification times from all the individual objects that make up your page, every time the page is requested.

PUSH: modify the critical methods that modify the state of the objects that make up your page, so that they maintain some global last-modified value.

The best solution may be a combination of both.

I would tend to the second option (right now the objects are all instances of the same zclass, so I have to touch just one "edit"-method). One problem is that there's still a timespan in which the proxy will deliver old content, and the problem is to purge the stale cached content - I'm talking about apache's mod_proxy here, which seems not to have a "purge" like squid. My idea is to extend the "push" method to also get the page with zclient with the headers pragma: no-cache cache-control: no-cache in order to get mod_proxy to revalidate the document. Any ideas someone if this is an ok approach? cheers, oliver