Re: ETag and resource representations

Hubert,

On 14.08.2013, at 03:11, Hubert A Le Van Gong <[email protected]> wrote:

> Greetings,
> 
> I have a question about associating ETag to resources in a REST-based architecture.
> Would you recommend associating a single ETag to the canonical (i.e. complete) resource or rather use a different ETag for each representations of said resource.
> For instance, if I consider a library (full of books) as a resource. The view of that resource (i.e. the list of books returned) may vary based on the age of the reader (or any other criteria). Should I consider one ETag for the library as a whole or should I create an ETag for each representation returned to each reader?
> 

ETag applies to the representation. If the actual bytes of the representation differ  the ETag must differ.

Jan


> Maybe another way to ask the same question: should the ETag management solely be based on the resource or also influenced by other factors surrounding requests for it (e.g. policies etc.)?
> 
> Cheers,
> Hubert
> 
> 



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