Is there a better list to use for questions about core modules?
I'm using mod_cache on Apache 2.0.55 (Debian Sid) with the following
config:
ProxyVia On
CacheRoot /var/cache/apache2/proxy
CacheSize 1000
CacheMaxExpire 300
CacheIgnoreHeaders Set-Cookie
ProxyReceiveBufferSize 16384
CacheEnable disk /
<proxy *>
allow from all
</proxy>
And I'm using a reverse proxy to connect to the back end machine.
The back end machine provides Last-Modified, Expires, and
Cache-Control headers.
When I first start up Apache files are cached. But, once they expire
then they are no longer cached and *always* fetch from the back end
server. It's as if the front end mod_cache server is not updating
it's Expires date.
Maybe I don't understand CacheMaxExpire setting??
For example here's two requests that were handled by the cache (note
the "Age:" header. The back end server was not accessed for these
requests.
moseley@bumby:~/WS2$ HEAD http://bumby:82/css/style.css
200 OK
Cache-Control: max-age=300
Connection: close
Date: Fri, 19 May 2006 20:35:57 GMT
Via: 1.1 localhost:82
Age: 223
Server: Apache/2.0.55 (Debian) mod_ssl/2.0.55 OpenSSL/0.9.8a
Content-Length: 2264
Content-Type: text/css
Expires: Fri, 19 May 2006 20:37:14 GMT
Last-Modified: Sun, 29 Jan 2006 14:59:44 GMT
Client-Date: Fri, 19 May 2006 20:35:57 GMT
Client-Peer: 192.168.1.2:82
Client-Response-Num: 1
moseley@bumby:~/WS2$ date -u
Fri May 19 20:36:19 UTC 2006
moseley@bumby:~/WS2$ HEAD http://bumby:82/css/style.css
200 OK
Cache-Control: max-age=300
Connection: close
Date: Fri, 19 May 2006 20:36:21 GMT
Via: 1.1 localhost:82
Age: 247
Server: Apache/2.0.55 (Debian) mod_ssl/2.0.55 OpenSSL/0.9.8a
Content-Length: 2264
Content-Type: text/css
Expires: Fri, 19 May 2006 20:37:14 GMT
Last-Modified: Sun, 29 Jan 2006 14:59:44 GMT
Client-Date: Fri, 19 May 2006 20:36:21 GMT
Client-Peer: 192.168.1.2:82
Client-Response-Num: 1
Now, once it got to 300 seconds the front-end server (running
mod_cache) *always* fetches the document from the back-end server:
moseley@bumby:~/WS2$ HEAD http://bumby:82/css/style.css
200 OK
Cache-Control: max-age=300
Connection: close
Date: Fri, 19 May 2006 20:37:41 GMT
Via: 1.1 localhost:82
Server: Apache/2.0.55 (Debian) mod_perl/2.0.2 Perl/v5.8.8
Content-Length: 2264
Content-Type: text/css
Expires: Fri, 19 May 2006 20:42:41 GMT
Last-Modified: Sun, 29 Jan 2006 14:59:44 GMT
Client-Date: Fri, 19 May 2006 20:37:42 GMT
Client-Peer: 192.168.1.2:82
Client-Response-Num: 1
moseley@bumby:~/WS2$ HEAD http://bumby:82/css/style.css
200 OK
Cache-Control: max-age=300
Connection: close
Date: Fri, 19 May 2006 20:37:47 GMT
Via: 1.1 localhost:82
Server: Apache/2.0.55 (Debian) mod_perl/2.0.2 Perl/v5.8.8
Content-Length: 2264
Content-Type: text/css
Expires: Fri, 19 May 2006 20:42:47 GMT
Last-Modified: Sun, 29 Jan 2006 14:59:44 GMT
Client-Date: Fri, 19 May 2006 20:37:47 GMT
Client-Peer: 192.168.1.2:82
Client-Response-Num: 1
Note that the back-end server returns both Cache-Control and Expires
headers without regard to http/1.0 vs http/1.1. Not sure if that
might be a problem or not.
--
Bill Moseley
moseley@xxxxxxxx
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