Thanks for the explanation! At least this means that the description of
CacheDefaultExpire is somewhat misleading , I think.
I don't use a reverse proxy and I have little control over the output
from the CGI program, but maybe mod_expires or mod_headers can add the
header before mod_cache evaluates the response?
Kind regards,
Frans Knibbe
Axel-Stéphane SMORGRAV wrote:
The problem is that the response contains no cache validator: no Last-Modified,
no E-Tag. If it contains no cache validator, it must contain an explicit
expiry date in order to be cacheable. Look at sections 13.3 and 13.4 of RFC
2616.
Your problem is typical of files generated by a servlet, or more generally by
an application and not served by a http server or the file servlet of an
application server.
You can have the application add a cache validator to the response, or you can
use ExpiresActive/ExpiresByType/ExpiresDefault to have your reverse proxy add
the Expires header. The problem is that I believe that the Expires header in
that case will be added after mod_cache has decided to decline to cache, but
you can try it anyway.
-ascs
-----Original Message-----
From: Frans Knibbe [mailto:[EMAIL PROTECTED]
Sent: Wednesday, March 08, 2006 3:58 PM
To: users@httpd.apache.org
Subject: [EMAIL PROTECTED] mod_cache: CacheDefaultExpire is ignored?
Hello,
I use apache 2.0.55 on Windows and I am experiencing a problem using mod_cache.
It is my intention to use a memory cache for images produced by a CGI program.
Here is the relevant bit of httpd.conf:
<IfModule mod_cache.c>
LoadModule mem_cache_module modules/mod_mem_cache.so
<IfModule mod_mem_cache.c>
CacheDefaultExpire 86400
CacheEnable mem /
MCacheSize 4096
MCacheMaxObjectCount 10000
MCacheMinObjectSize 1
MCacheMaxObjectSize 104857600
MCacheMaxStreamingBuffer 104857600
MCacheSize 409600
</IfModule>
</IfModule>
If I let Apache log debug information, I can see that caching is active.
Some caching takes place, but not the images I want cached. In that case, something like this is reported:
[Wed Mar 08 14:09:11 2006] [debug] mod_cache.c(446): cache: <request> not
cached. Reason: Query string present but no expires header
There is no expiration time in the header, that is true, but shouldn't CacheDefaultExpire be used in that case? In the documentation it says:
"The CacheDefaultExpire directive specifies a default time, in seconds, to cache a document if neither an expiry date nor last-modified date are provided with the document". So if there is no expires header the expiry time should be set to one day (86400 seconds) in this case, right?
Am I overlooking something? How can I get caching to work?
Thanks in advance,
Frans Knibbe
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