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Re: "Variant" language in Content-Location (Issue 109)

From: Henrik Nordstrom <henrik@henriknordstrom.net>
Date: Thu, 07 Aug 2008 16:31:56 +0200
To: Julian Reschke <julian.reschke@gmx.de>
Cc: Stefan Eissing <stefan.eissing@greenbytes.de>, HTTP Working Group <ietf-http-wg@w3.org>
Message-Id: <1218119516.28467.69.camel@hlaptop.henriknordstrom.net>

ons 2008-08-06 klockan 15:42 +0200 skrev Julian Reschke:
> Stefan Eissing wrote:
> > Is there a need to express the client's expectation that the 
> > "Content-Location" URL will only have a single entity associated with 
> > it? Or is a client expected to follow "Content-Location"s for a number 
> > of times?
> 
> I wouldn't want to encourage that case, but would anything break if that 
> happened?

The cache model of HTTP assumes that Content-Location is unique per
variant of the request-URI, which kind of implies that the
Content-Location URI is not a negotiated resource. For each Request-URI
Content-Location has the same uniqueness requirement across the variants
(but not versions) as ETag.  ETag is also version unique..

And when Content-Location is placed in the original HTTP content model
then it's very clear.. Content-Location is a direct unique reference URI
to a specific resource object with no negotiation or transformation.

Regards
Henrik
Received on Thursday, 7 August 2008 14:30:59 GMT

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