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From "Aleksander Adamowski (JIRA)" <jetspeed-...@portals.apache.org>
Subject [jira] Created: (JS2-303) ContentServer doesn't allow for content caching
Date Fri, 01 Jul 2005 21:38:59 GMT
ContentServer doesn't allow for content caching
-----------------------------------------------

         Key: JS2-303
         URL: http://issues.apache.org/jira/browse/JS2-303
     Project: Jetspeed 2
        Type: Improvement
  Components: ContentServer  
    Versions: 2.0-M3    
 Environment: Linux, Sun JDK-1.5.0, Tomcat 5.0.30
    Reporter: Aleksander Adamowski


The files comprising Velocity templates (especially images) are prevented from being cached
in proxies and end user browsers, which creates significant bandwidth/resources waste.

This is because the ContentServer doesn't provide any cache control headers (Expires, Last-Modified,
Cache-Control) and doesn't react to client's cache related headers (If-Modified-Since). 
When serving ordinary files from Velocity template directories, ContentServer has access to
necessary data - notably file modification timestamps, so it could generate proper cache control
headers.

An example site with its performance suffering because of this: http://kwiaty.altkom.pl:8880/jetspeed/
(notice that the images load with each page view, again and again, instead of being cached
on client side).

There's an excellent tutorial on HTTP caching techniques here: http://www.mnot.net/cache_docs/

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