how to set ETag response header from ServerResource annotated method?

[Andy Dennie]

I'd like to set an ETag response header while processing a request within my 
ServerResource subclass.  I tried 

getResponseEntity().setTag(new Tag("foo));

but this doesn't work, because there is no entity in the response object yet 
(getResponseEntity returns null).

What's the right way to do this? 

Thanks.
-Andy

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