Thanks I got it working. I had to use CacheIgnoreQueryString On because backend webserver was not sending expiration time and cache module in apache won't cache the resource if it has query strings and it has no expiration module. I resolved this by turning off CacheIgnoreQueryString on apache caching server and enabling mod_expires.so on backend webserver as shown below:
LoadModule expires_module modules/mod_expires.so ExpiresDefault "access plus 1 month" ExpiresActive On It looks like everything is working good. Thanks!!! Alexandru David Constantinescu wrote: > > dd123 wrote: >> You are right. My apache switched to different runtime user though it >> started >> as root. >> I changed the dir permission and atleast I can see some contents in the >> cache dir >> But now, I have hit another roadblock: >> >> Basically, I want the images to be served via cache and my images are >> distinguishable through query string >> >> http://backend-server.abc.com/mcs-stream-war/asset/streamAsset?id=e98a887b-2eb1-456d-ba18-d21a1b0b345th >> >> http://backend-server.abc.com/mcs-stream-war/asset/streamAsset?id=e98a887b-2eb1-456d-ba18-d21a1b0b456ft >> >> http://backend-server.abc.com/mcs-stream-war/asset/streamAsset?id=e98a887b-2eb1-456d-ba18-d21a1b023wert >> >> >> The problem is: Apache caching solution is ignoring whatever is there in >> the query string after ?. >> It means that whatever value I send in the query string, I am always >> served >> the first image. >> >> How can force apache caching solution to recognize the query strings and >> store images and its associated query string. >> >> >> Snippet from error_log: >> >> >> [Tue Jan 27 21:43:36 2009] [debug] mod_disk_cache.c(476): disk_cache: >> Recalled cached URL info header >> http://reverse-proxywebserver.abc.com:80/mcs-stream-war/asset/streamAsset? >> [Tue Jan 27 21:43:36 2009] [debug] mod_disk_cache.c(749): disk_cache: >> Recalled headers for URL >> http://reverse-proxywebserver.abc.com:80/mcs-stream-war/asset/streamAsset? >> [Tue Jan 27 21:43:36 2009] [debug] mod_cache.c(282): cache: running >> CACHE_OUT filter >> [Tue Jan 27 21:43:36 2009] [debug] mod_cache.c(296): cache: serving >> /mcs-stream-war/asset/streamAsset >> [Tue Jan 27 21:44:19 2009] [debug] mod_disk_cache.c(476): disk_cache: >> Recalled cached URL info header >> http://reverse-proxywebserver.abc.com:80/mcs-stream-war/asset/streamAsset? >> [Tue Jan 27 21:44:19 2009] [debug] mod_disk_cache.c(749): disk_cache: >> Recalled headers for URL >> http://reverse-proxywebserver.abc.com:80/mcs-stream-war/asset/streamAsset? >> >> >> Alexandru David Constantinescu wrote: >>> dd123 wrote: >>>> I have a webserver servicing the images and url for that webserver >>>> looks >>>> like >>>> this: >>>> >>>> http://backend-server.abc.com/mcs-stream-war/asset/streamAsset?id=e98a887b-2eb1-456d-ba18-d21a1b0b06cc >>>> >>>> The above URL is basically an image. >>>> >>>> Now, I want to front this webserver with a reverse proxy caching apache >>>> webserver. The reverse proxy part is workign good but it looks like >>>> the >>>> caching is not working at all. I want to use disk based caching and my >>>> config looks like this: >>>> >>>> ProxyRequests off >>>> ProxyPass /mcs-stream-war/asset/ >>>> http://backend-server.abc.com/mcs-stream-war/asset/ >>>> ProxyPassReverse /mcs-stream-war/asset/ >>>> http://backend-server.abc.com/mcs-stream-war/asset/ >>>> >>>> >>>> CacheRoot /opt/apache2.2.11-mcs-caching/diskcache-store >>>> CacheEnable disk / >>>> CacheDirLevels 2 >>>> CacheDirLength 1 >>>> CacheMaxFileSize 100000000 >>>> CacheIgnoreCacheControl On >>>> CacheIgnoreNoLastMod On >>>> CacheIgnoreNoLastMod On >>>> CacheMaxExpire 604800 >>>> CacheIgnoreQueryString On >>>> >>>> Here are my observations and issues: >>>> >>>> 1) when I hit the given reverse proxy apache server with this url: >>>> http://reverse-proxywebserver.abc.com/mcs-stream-war/asset/streamAsset?id=e98a887b-2eb1-456d-ba18-d21a1b0b06cc, >>>> I can see that I am being served the image as the reverse proxy >>>> webserver >>>> gets connection to the backend resource >>>> http://backend-server.abc.com/mcs-stream-war/asset/ and serves the >>>> image >>>> >>>> 2) But the caching part is not working at all. Nothing is being created >>>> in >>>> the caching directory at all. >>>> >>>> Here are the debug error messages: >>>> >>>> >>>> [Tue Jan 27 18:55:46 2009] [debug] mod_cache.c(131): Adding CACHE_SAVE >>>> filter for /mcs-stream-war/asset/streamAsset >>>>> not cached. Reason: HTTP Status 304 Not Modified >>>> [Tue Jan 27 18:57:08 2009] [debug] proxy_util.c(2009): proxy: HTTP: has >>>> released connection for (backend-server.abc.com) >>>> >>>> >>>> >>>> Please help me with this. My gut feeling is: I am missing some small >>>> config.. >>>> >>>> >>> Hi >>> >>> Check permissions on your cache folder (apache user must be able to >>> write in there) >>> >>> alex >>> >>> >>> --------------------------------------------------------------------- >>> The official User-To-User support forum of the Apache HTTP Server >>> Project. >>> See <URL:http://httpd.apache.org/userslist.html> for more info. >>> To unsubscribe, e-mail: users-unsubscr...@httpd.apache.org >>> " from the digest: users-digest-unsubscr...@httpd.apache.org >>> For additional commands, e-mail: users-h...@httpd.apache.org >>> >>> >>> >> > Hi, again > > So , by using CacheIgnoreQueryString On you tell apache to serve from > cache like ther is no query string (the same url every time). Try to > disable this option. With this option Off , apache basically will make > one file/query > > Alex > > --------------------------------------------------------------------- > The official User-To-User support forum of the Apache HTTP Server Project. > See <URL:http://httpd.apache.org/userslist.html> for more info. > To unsubscribe, e-mail: users-unsubscr...@httpd.apache.org > " from the digest: users-digest-unsubscr...@httpd.apache.org > For additional commands, e-mail: users-h...@httpd.apache.org > > > -- View this message in context: http://www.nabble.com/apache-caching-not-working-tp21693092p21696858.html Sent from the Apache HTTP Server - Users mailing list archive at Nabble.com. --------------------------------------------------------------------- The official User-To-User support forum of the Apache HTTP Server Project. See <URL:http://httpd.apache.org/userslist.html> for more info. To unsubscribe, e-mail: users-unsubscr...@httpd.apache.org " from the digest: users-digest-unsubscr...@httpd.apache.org For additional commands, e-mail: users-h...@httpd.apache.org
