Re: New Version Notification for draft-nottingham-httpbis-pre-denied-00.txt

Hi Mark,

I've read the linked context and the draft, and I am concerned that this
will cause folks to simply drop the Sec-Purpose header with pre-fetch;
tying the result to that seems pretty fragile.  The approach described in
503 with retry-after seemed pretty compelling, and if it were not for the
customer issues you raised, I would have suggested that you pursue that.
Given those are focused on 500 series responses, would you consider 4xx
with a retry-after, which could be used both in the case you mentioned
(pre-fetch) and whenever else the server felt a resource would be available
at a specific point?

regards,

Ted

On Tue, Feb 24, 2026 at 12:24 AM Mark Nottingham <mnot@mnot.net> wrote:

> (without my 'chair' hat on)
>
> I'd like the WG to consider adoption. See here for context:
>   https://github.com/WICG/nav-speculation/issues/138
>
> Cheers,
>
>
> Begin forwarded message:
>
> *From: *internet-drafts@ietf.org
> *Subject: **New Version Notification for
> draft-nottingham-httpbis-pre-denied-00.txt*
> *Date: *24 February 2026 at 10:18:02 am AEDT
> *To: *"Mark Nottingham" <mnot@mnot.net>
>
> A new version of Internet-Draft draft-nottingham-httpbis-pre-denied-00.txt
> has
> been successfully submitted by Mark Nottingham and posted to the
> IETF repository.
>
> Name:     draft-nottingham-httpbis-pre-denied
> Revision: 00
> Title:    The Preliminary Request Denied HTTP Status Code
> Date:     2026-02-23
> Group:    Individual Submission
> Pages:    4
> URL:
> https://www.ietf.org/archive/id/draft-nottingham-httpbis-pre-denied-00.txt
> Status:
> https://datatracker.ietf.org/doc/draft-nottingham-httpbis-pre-denied/
> HTML:
> https://www.ietf.org/archive/id/draft-nottingham-httpbis-pre-denied-00.html
> HTMLized:
> https://datatracker.ietf.org/doc/html/draft-nottingham-httpbis-pre-denied
>
>
> Abstract:
>
>   This specification defines a HTTP status code to indicate that the
>   server is denying a prefetch or preload request.
>
> About This Document
>
>   This note is to be removed before publishing as an RFC.
>
>   Status information for this document may be found at
>   https://datatracker.ietf.org/doc/draft-nottingham-httpbis-pre-
>   denied/.
>
>   information can be found at https://mnot.github.io/I-D/.
>
>   Source for this draft and an issue tracker can be found at
>   https://github.com/mnot/I-D/labels/pre-denied.
>
>
>
> The IETF Secretariat
>
>
>
> --
> Mark Nottingham   https://www.mnot.net/
>
>