Re: i22: ETags on PUT responses

Julian Reschke wrote:
> 
> In particular:
> 
> - E does not apply to Rq
> 
> - the presence of E in Rs does not necessarily imply that the body sent 
> with PUT was stored octet-by-octet
> 
> - E does not depend on the request method, just on URI & selecting headers
> 
I wonder what the intended use of this Etag, sent in response to a 
PUT-request, would be. As the entity, sent in a subsequent GET is not 
guaranteed to be equal to the body of the PUT-request, not a single 
client knows the entity. But clients get an entity-tag - for an unknown 
entity. What are they supposed to use it for?

Werner