Re: Strange mod_cache & expires header interaction

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On 5/24/07, Christopher Shumway <cshumway@xxxxxxxxxxxxxxxxx> wrote:
Hi httpd users,

I've been testing Apache httpd 2.2.4 as a reverse-caching proxy server but
I've ran into some odd behavior with how its handling expired content.
Currently I'm using the worker MPM and mod_mem_cache to provide the storage.
I haven't tested this with prefork or mod_disk_cache yet, but if its worth it
I can test that configuration too. Here are some entries from the error log
with loglevel debug:

Note that the Content-Encoding gzip is actually from Apache 2.2.4 not the
backend.

I would try two things:

1. mod_disk_cache, which is better tested and maintained than
mod_mem_cache, and will often be just as performant given a good
virtual file system layer.

2. Remove the gzip encoding. There are some fixes recently introduced
in trunk for problems with vary-processing in the cache. These may (or
may not) be causing the problem you see. They will probably make it
into the next 2.2 release.

Joshua.

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