Re: ORIGIN - suggested changes

Martin Thomson <martin.thomson@gmail.com> Thu, 02 February 2017 01:25 UTC

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From: Martin Thomson <martin.thomson@gmail.com>
Date: Thu, 2 Feb 2017 10:23:18 +0900
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To: Mark Nottingham <mnot@mnot.net>
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Subject: Re: ORIGIN - suggested changes
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On 2 February 2017 at 10:12, Mark Nottingham <mnot@mnot.net> wrote:
> I don't buy the argument that removal itself adds complexity. Implementations already need to remember what origins they received a 421 for, so they already have the concept of origin set removal.

Well, you just established why it might be unnecessary.  The gain here
is in the client not sending a request to the wrong place.  But if
this is rare enough, then that cost is probably bearable.

The "everything except those" case doesn't concern me that much.  I
know it's relatively common, but it is fairly rare that the set of
origins that are used is not easily enumerable, or incrementally
discoverable.