you have to alter the default download() function to return cache headers.
The "theoretical" problem is that web2py (and then the wiki) doesn't know 
when the image stored in a table would be updated, so it doesn't issue any 
cache headers by default. 

On Thursday, January 31, 2013 9:49:21 PM UTC+1, Paolo valleri wrote:
>
> Hi all, 
> today I discovered that wiki media, actually they are all images, they are 
> always requested to the server and never cached by the client. In other 
> words, even if I have already visited the page I do a get to download all 
> the images instead of using those in the browser cache as commonly happens 
> with for js or css. Is it a problem of my configuration or of wiki it self? 
>
> paolo
>

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