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Date: Thu, 12 Jan 2006 15:12:56 +0100
Message-ID: <8C29B2F93BAE9047A906EF6D6F9C5D43012F97FD@exchange2k301.gaia.fr>
Thread-Topic: [users@httpd] Apache reverse and caching proxy
Thread-Index: AcYXgNNbXwp2EaW1R22z7h32nGLIPQAAJmfw
From: =?iso-8859-1?Q?Axel-St=E9phane__SMORGRAV?=
 <Axel-Stephane.SMORGRAV@europe.adp.com>
To: <users@httpd.apache.org>
Subject: RE: [users@httpd] Apache reverse and caching proxy

The mod_expires that you activate with "ExpiresActive On" will add an =
Expires header to the responses sent to the client. It does nothing for =
Apache cache expiration. It does however have an effect on the =
expiration of downstream caches, in your case probably on the User Agent =
cache.

For cache expiration you should use the CacheDefaultExpire directive.  I =
believe mod_cache will make a conditional request for the resource when =
the cache entry gets stale.=20

If you set CacheDefaultExpires to a low value, mod_cache will frequently =
try to refresh the cache.=20

CacheDefaultExpires affects only responses that do not contain an =
explicit expiry date.
=20
-ascs
________________________________

From: Wim.Van.Leuven@ldc.be [mailto:Wim.Van.Leuven@ldc.be]=20
Sent: Thursday, January 12, 2006 3:02 PM
To: users@httpd.apache.org
Subject: [users@httpd] Apache reverse and caching proxy


Hello all,=20

I'm retrying my configuration for a caching proxy server which flushes =
the cache on the modification time of the files. However, It doesn't =
seem to work anymore. The files get cached but are not refreshed on a =
touch of the file on the source server.=20

Not sure what I changed that it doesn't work anymore. As far as I'm =
concerned, I do nothing more then setup an apache server to serve static =
files from disk in an ordinary manner. Next I put a proxy server in =
front. The configuration of the proxy can be found at the end.=20

When inspecting the debug logs and the http headers, all files get =
cached at the proxy. However when I change the modification time of the =
files on the source servers, the cache doesn't get updated. Thus still =
serving the old version of the file.=20

As a matter a fact, once a file is cached, the source server is never =
accessed anymore to verify the correctness of the cache against the =
remote instances.=20

Does anybody have a clue about which sublety I'm missing here?=20

Thanks beforehand!=20
Wim Van Leuven=20

________________________________=20

...=20
ExpiresActive On=20
ExpiresDefault "modification"=20
...=20
ProxyRequests Off=20

<Proxy *>=20
    Order deny,allow=20
    Allow from all=20
</Proxy>=20

ProxyPass / http://srcsvr.ldc.local/=20
ProxyPassReverse / http://srcsvr.ldc.local/=20

# Cache configuration=20
<IfModule mod_cache.c>=20
    LoadModule disk_cache_module modules/mod_disk_cache.so=20
    <IfModule mod_disk_cache.c>=20
            CacheRoot "C:/Program Files/Apache Group/Apache2/cache"=20
            CacheSize 256=20
            CacheEnable disk /=20
            CacheDirLevels 5=20
            CacheDirLength 3=20
            CacheIgnoreCacheControl Off=20
    </IfModule>=20
   =20
    #LoadModule mem_cache_module modules/mod_mem_cache.so=20
    <IfModule mod_mem_cache.c>=20
        CacheEnable mem /=20
        MCacheSize 4096=20
        MCacheMaxObjectCount 100=20
        MCacheMinObjectSize 1=20
        MCacheMaxObjectSize 2048=20
    </IfModule>    =20
</IfModule>=20


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