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[Rats] Re: draft-ietf-rats-coserv-07 early Httpdir review

Paul Howard <Paul.Howard@arm.com> Mon, 24 August 2026 09:30 UTC

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From: Paul Howard <Paul.Howard@arm.com>
To: Mark Nottingham <mnot@mnot.net>
Thread-Topic: draft-ietf-rats-coserv-07 early Httpdir review
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Date: Mon, 24 Aug 2026 09:30:02 +0000
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CC: Lucas Pardue <lucas@lucaspardue.com>, "ietf-http-wg@w3.org" <ietf-http-wg@w3.org>, "draft-ietf-rats-coserv.all@ietf.org" <draft-ietf-rats-coserv.all@ietf.org>, "rats@ietf.org" <rats@ietf.org>, nd <nd@arm.com>, Thomas Fossati <tho.ietf@gmail.com>
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Subject: [Rats] Re: draft-ietf-rats-coserv-07 early Httpdir review
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Hi, Mark.


On 24/08/2026, 10:24, "Mark Nottingham" <mnot@mnot.net> wrote:

Hi Paul,
> On 24 Aug 2026, at 9:58 am, Paul Howard <Paul.Howard@arm.com> wrote:
>
> ISSUE 2: Safe methods and HEAD
>
> SUGGESTED CHANGE: We will explicitly disallow HEAD method support as a “MUST NOT”, instructing servers to return the 405 status code if this method is attempted. The rationale is that CoSERV providers are not general-purpose servers. CoSERV is a specialised protocol. There is no value in the HEAD method for the case of a CoSERV query.
You can't override a requirement of HTTP and still use the protocol. If this is deployed on generic HTTP infrastructure (servers, proxies, CDNs, clients), your requirement will be violated.


PH> To clarify, the intention here would be to disallow HEAD on the origin​ server only (admittedly not very clear from my post). Lucas’s original review suggested that this would be a reasonable step. CoSERV providers are not general-purpose web servers, so the constraint on those ought to be valid, but wouldn’t apply to infrastructure.

Thanks,
Paul.

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