The final solution was to override the handle() method of ServerResource :
@Override
public Representation handle() {
Representation representation = super.handle();
if (ret != null) {
new StrongEtagCallback<Account>(ret).handle(getRequest(),
getResponse());
}
return representation;
}
The ETAG header is now sent :
HTTP/1.1 200 OK
Content-Type: application/x-java-serialized-object+gwt; charset=UTF-8
**ETag: "Account-104-27012012003721199"**
Date: Thu, 26 Jan 2012 23:44:32 GMT
Accept-Ranges: bytes
Server: Restlet-Framework/2.1rc1
Transfer-Encoding: chunked
Setting a callback setOnSent is exectued after the response is committed,
that's why this solution did not work.
I would actually expect a similar hook or some kinda setNext() Restlet to do
post processing. After all, StrongEtagCallback implements Uniform.
IMO, this would fit much better in the overall architecture of Restlet. Or do I
mix things up here.
FYI: cross-posting on SO :
http://stackoverflow.com/questions/9015511/setting-etag-lastmodified-on-representation-sent-by-serverresource
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