Caching of external data (http request)

[taabpr]

Hi all,
I want to cache some request from another server.
So in my sitemap:
       <map:pipeline type="caching">
           <map:parameter name="expires" value="access plus 1 hours"/>
           <map:match pattern="data.xml">
               <map:generate type="file" src="http://foo/data.xml"/>
               <map:serialize type="xml"/>
           </map:match>
           <map:match pattern="test">
               <map:generate type="file" src="cocoon:/data.xml"/>
               <map:serialize type="xml"/>
           </map:match>
and for testing I call the 'test'. Unfortunately all the time the 
http://foo is called. Why?
Is the parameter 'expires' used only for the browser (and not the cocoon 
pipelines)? If so, why it is so :)?
And how to set it for file generator? (I've checked the archive and 
haven't found any working solution/sample, although it was very often 
asked).
   Tom


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