I now have this HTTP traffic, using ETags and modification date, which is 
perfect :

Request
GET Entity
If-non-match [104-1327680277477]
If-modified-since Fri Jan 27 17:04:37 CET 2012
Cache directives []
Response 304
Description Not Modified
Entity LastModified
Cache directives []
ETag "104-1327680277477"

In the resource callback, the entity is NULL because response is 304. So I have 
to keep a variable at all time of the old version, right ?
Is it possible to still get a cached copy in the callback, maybe relying on the 
browser cache ?

> On Fri, Jan 27, 2012 at 9:28 AM, Koen Maes <koen at koma dot be> wrote:
> 
> > double checking, and handle does not provide req, resp as parameters,
> > either.
> >
> 
> Are you talking about ServerResource.handle()? You probably shouldn't
> override that if you're using annotated methods.
> 
> 
> But in the flow of handling, I assume everything is done overriding
> > handle() whereas I am unsure at one point in the overall handling
> > "toRepresentation(...)" is being called.
> > That's why I opted for overriding handle()
> >
> 
> toRepresentation is called when converting the return value of the
> annotated handler method to a representation. It's really the ideal place
> to copy values from the returned object into the representation metadata.
> Call super.toRepresentation(source, target) to get the representation, and
> then use whatever machinery you need to get information out of the source
> and into that representation.
> 
> --tim

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