Basant Kukreja
Tuesday Aug 12, 2008
Caching static content in reverse proxy in Sun Java System Web Server 7.0
Sun Java System Web Server 6.1 has a function named "check-passsthrough" which will look the resource in reverse proxy instance's docroot first. I was wondering how to do so in 7.0. I didn't find any documentation for that. The advantage of serving static content from reverse proxy docroot is that it is very efficient. Sun Web Server has a excellent caching capabilities which often backend servers don't have.Basically user need to do the following test :
* If file exists on local document root then serve the file else go to back-end instance.
Here is how we can do it in WS 7.0.
1) Define docroot variable for each virtual server :
<virtual-server>
...
<variable>
<name>docroot</name>
<value>/mydocroot/https-rpp/docs</value>
</variable>
</virtual-server>
2) Modify the obj.conf to look for local resources before redirecting :
<If not -f "$docroot/$path">
NameTrans fn="map" from="/" name="reverse-proxy-/" to="http:/"
</If>
Web Server 7.0, file cache is enabled by default. So all static content will be
cached by default. set-file-cache-prop wadm command can be used to tune the
file cache content.
Posted at 07:59PM Aug 12, 2008 by Basant Kukreja in Sun Web Server | Comments[0]
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