Hi.
We are using a combination of mod_disk_cache and mod_rewrite in front of
our portal to achieve setup where
1) Logged in administration users see live uncached view of the site
2) Normal users see a version served from the Apache (2.2.3) cache (120
sec delay)
The problem is that mod_rewrite and mod_disk_cache don't appear to well
together and mod_disk_cache seems to ignore all that mod_rewrite does.
We are using rewrite rule
RewriteCond %{HTTP_COOKIE} ^(.*?;\s+)?LOGIN=
RewriteRule (.*) /no-cache$1 [PT]
which rewrites all requests which include LOGIN-cookie (admin users) to
"/no-cache" and
ProxyPass /no-cache/ ajp://localhost:8009/
to proxy the request over AJP to Tomcat.
Then we are using cache settings which ignore all cache related headers
and forces requests to be servers from the cache.
CacheDefaultExpire 120
CacheMaxExpire 120
CacheIgnoreCacheControl on
CacheIgnoreNoLastMod on
CacheIgnoreHeaders Set-Cookie, Last-Modified, Cache-Control
CacheRoot /var/cache/mod_proxy
CacheDirLevels 5
CacheDirLength 3
CacheDisable /no-cache
CacheEnable disk /web/guest/home
CacheEnable disk /image/journal/article
CacheEnable disk /c/portal/css_cached
CacheEnable disk /c/portal/javascript_cached
The problem is that even though rewrite rule seems to work, mod_cache
seems to use the original unrewritten path and everything is cached.
The following log seems to suggest that mod_deflate sees the rewritten
path but mod_cache uses to original unrewritten path.
[Fri Oct 05 10:45:48 2007] [debug] mod_deflate.c(447): [client
192.168.18.212] Zlib: Compressed 11716 to 11674 : URL
/no-cache/image/journal/article, referer:
http://kala20.host.com/web/guest/home
[Fri Oct 05 10:45:48 2007] [debug] mod_headers.c(612): headers:
ap_headers_output_filter()
[Fri Oct 05 10:45:48 2007] [debug] mod_cache.c(502): cache:
/image/journal/article?img_id=16905 not cached. Reason: Query string
present but no expires header
rewrite.log
192.168.18.212 - - [05/Oct/2007:10:45:20 +0300]
[kala20.host.com/sid#8c51d48][rid#8e72ea8/initial] (2) rewrite
'/web/guest/home' -> '/no-cache/web/guest/home'
192.168.18.212 - - [05/Oct/2007:10:45:20 +0300]
[kala20.host.com/sid#8c51d48][rid#8e72ea8/initial] (2) forcing
'/no-cache/web/guest/home' to get passed through to next API
URI-to-filename handler
Is this a viable approach? Is there any other possible solutions for
achieving the this setup.
* Janne Kario
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