mod_disk_cache - directive CacheRoot ignored in context "server config" but not inside a v

Hi,

I have an issue with Apache's mod_disk_cache and the config directive =
CacheRoot. The versions used are as follows. It's a default Debian 5 =
Apache with mpm-worker used as a reverse proxy.

# apache2ctl -V
Server version: Apache/2.2.9 (Debian)
Server built: Jul 14 2009 20:40:18
Server's Module Magic Number: 20051115:15
Server loaded: APR 1.2.12, APR-Util 1.2.12
Compiled using: APR 1.2.12, APR-Util 1.2.12
Architecture: 64-bit
Server MPM: Worker
threaded: yes (fixed thread count)
forked: yes (variable process count)


The CacheRoot is defined via an include (Debian's default config layout) =
and mapped into the main config.

CacheRoot /var/cache/apache2/mod_disk_cache

My guess (as per documentation) is that this defines the default =
CacheRoot to be used by all configured proxy virtual hosts. If I now =
define a virtual host like the following:


[...]
ProxyVia On
ProxyPreserveHost On
ProxyPass / balancer://something/

BalancerMember http://backend1
BalancerMember http://backend2

CacheMaxFileSize 8000000
CacheEnable disk /


The proxy now works as expected, but nothing will be cached in the disk =
cache. There are no age headers generated by the proxy on served =
requests. Now if I add the directive
CacheRoot /var/cache/apache2/mod_disk_cache
to this virtual host, the disk cache fills and age headers are sent as =
expected.

I feel like I'm missing something or made a really stupid mistake with =
the config. It works if I repeat the CacheRoot statement for all virtual =
hosts, but I'd rather define it globally since there are quite a number =
of virtual hosts.

Thanks and kind regards,

Oliver Feiler





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