cache image

[Herbert Yau <he...@hotmail.com>]

Hi list,

This question might be asked in the list before, but I can not found any 
good answer in the archive so please forgive me if i ask a stupid question 
here.

I am currently building a web site and there are some places that I would 
like to use image swap (you know, the standard dreamweaver rollover kind of 
function). However we found that after the page is completely loaded, images 
in the page does not get cached.  As a result, everytime we have a mouseover 
event, a new image (which could be loaded up before but not cached) is 
downloaded from the server each time instead of reading from cache, and the 
performance is really bad.
I am sure it is not the browser setting problem since we have tried out 
other site with similar functionality and it works completely fine.

I am using Tomcat4.1.18 Only. I try to find a way to config tomcat to 
specify the http expire header info but with no success. I know in apache 
there is something like "ExpiresByType" which can set the expire time 
according to the file type. Is tomcat has something like this?
Are there any better ways other than setting each jsp with 
response.setDataHeader(...) ?

Best Regards,

Herb



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