Please find an updated markdown file at:
https://raw.githubusercontent.com/tlswg/draft-ietf-tls-esni/baf67ab50fb5238eab07d7e3f081aec4495c4742/rfc9849.md

On Mon, Feb 16, 2026 at 8:14 AM Christopher Wood <[email protected]>
wrote:

> I approve publication of the latest document. Thanks for the work, all.
>
> Best,
> Chris
>
> > On Feb 11, 2026, at 4:25 PM, Madison Church <
> [email protected]> wrote:
> >
> > Hi Kazuho,
> >
> > Thank you for your reply! We have updated our files to match your name
> preference for consistency with other RFCs.
> >
> > For the change regarding HpkeKeyConfig, we will wait for additional
> reviews/comments.
> >
> > The files have been posted here (please refresh):
> > https://www.rfc-editor.org/authors/rfc9849.txt
> > https://www.rfc-editor.org/authors/rfc9849.pdf
> > https://www.rfc-editor.org/authors/rfc9849.html
> >
> > Markdown file:
> > https://www.rfc-editor.org/authors/rfc9849.md
> >
> > The relevant diff files have been posted here (please refresh):
> > https://www.rfc-editor.org/authors/rfc9849-diff.html (comprehensive
> diff)
> > https://www.rfc-editor.org/authors/rfc9849-rfcdiff.html (side by side)
> > https://www.rfc-editor.org/authors/rfc9849-auth48diff.html (diff
> showing AUTH48 changes)
> > https://www.rfc-editor.org/authors/rfc9849-auth48rfcdiff.html (side by
> side)
> >
> > Markdown diffs:
> > https://www.rfc-editor.org/authors/rfc9849-md-diff.html
> > https://www.rfc-editor.org/authors/rfc9849-md-rfcdiff.html
> > https://www.rfc-editor.org/authors/rfc9849-md-auth48diff.html
> > https://www.rfc-editor.org/authors/rfc9849-md-auth48rfcdiff.html
> >
> > For the AUTH48 status of this document, please see:
> > https://www.rfc-editor.org/auth48/rfc9849
> >
> > Thank you!
> >
> > Madison Church
> > RFC Production Center
> >
> >> On Feb 5, 2026, at 12:39 AM, Kazuho Oku <[email protected]> wrote:
> >>
> >> Hello Madison, authors,
> >>
> >> Thank you very much for pushing the draft forward.
> >>
> >> I have read through the updated markdown and I would like to request
> two nits.
> >>
> >> I've separately filed a PR
> >> (https://github.com/tlswg/draft-ietf-tls-esni/pull/672), but the nits
> >> are:
> >>
> >> # Section 5 and Section 6.1: Incorrect references to properties of
> HpkeKeyConfig
> >>
> >> `cipher_suites`, `kem_id`, `public_key` are members of
> >> `HpkeKeyConfig`, and therefore it would be correct to refer to them as
> >> `ECHConfigContents.key_config.~`. However, `key_config` is missing.
> >>
> >> IMO this is editorial, however it is not a grammatical error, and
> >> therefore would appreciate reviews from other authors.
> >>
> >> # Update my name to use Kanji
> >>
> >> This would make the representation consistent with other RFCs that I
> coauthored.
> >>
> >> For the ease of the review, the diff file against the TXT version is
> attached.
> >>
> >> 2026年2月4日(水) 6:32 Madison Church <[email protected]>:
> >>>
> >>> Hi Eric,
> >>>
> >>> Thank you for the updated markdown file! Updated files are listed
> below. We will wait to hear from you once you’ve completed your
> top-to-bottom read.
> >>>
> >>> For details of the AUTH48 process in kramdown-rfc (including the
> two-part approval process), see
> https://www.rfc-editor.org/rpc/wiki/doku.php?id=pilot_test_kramdown_rfc.
> >>>
> >>> The files have been posted here (please refresh):
> >>> https://www.rfc-editor.org/authors/rfc9849.txt
> >>> https://www.rfc-editor.org/authors/rfc9849.pdf
> >>> https://www.rfc-editor.org/authors/rfc9849.html
> >>>
> >>> Markdown file:
> >>> https://www.rfc-editor.org/authors/rfc9849.md
> >>>
> >>> The relevant diff files have been posted here (please refresh):
> >>> https://www.rfc-editor.org/authors/rfc9849-diff.html (comprehensive
> diff)
> >>> https://www.rfc-editor.org/authors/rfc9849-rfcdiff.html (side by side)
> >>> https://www.rfc-editor.org/authors/rfc9849-auth48diff.html (diff
> showing AUTH48 changes)
> >>> https://www.rfc-editor.org/authors/rfc9849-auth48rfcdiff.html (side
> by side)
> >>>
> >>> Markdown diffs:
> >>> https://www.rfc-editor.org/authors/rfc9849-md-diff.html
> >>> https://www.rfc-editor.org/authors/rfc9849-md-rfcdiff.html
> >>> https://www.rfc-editor.org/authors/rfc9849-md-auth48diff.html
> >>> https://www.rfc-editor.org/authors/rfc9849-md-auth48rfcdiff.html
> >>>
> >>> For the AUTH48 status of this document, please see:
> >>> https://www.rfc-editor.org/auth48/rfc9849
> >>>
> >>> Thank you!
> >>>
> >>> Madison Church
> >>> RFC Production Center
> >>>
> >>>> On Feb 3, 2026, at 2:17 PM, Eric Rescorla <[email protected]> wrote:
> >>>>
> >>>> Here is an updated markdown file with the outstanding PRs. The
> technical ones
> >>>> were reviewed.
> >>>>
> >>>>
> https://raw.githubusercontent.com/tlswg/draft-ietf-tls-esni/18715d4e44626db8f3460442e363ede9526277b0/rfc9849.md
> >>>>
> >>>> I still need to do my top-to-bottom read.
> >>>>
> >>>> -Ekr
> >>>>
> >>>>
> >>>> On Tue, Feb 3, 2026 at 11:55 AM Madison Church <
> [email protected]> wrote:
> >>>> Hi Authors,
> >>>>
> >>>> This is another friendly weekly reminder that we await content
> approvals from Christopher, Kazuho, and Eric before moving along with
> formatting updates for this document.
> >>>>
> >>>> Thank you!
> >>>>
> >>>> Madison Church
> >>>> RFC Production Center
> >>>>
> >>>>> On Jan 27, 2026, at 2:37 PM, Madison Church <
> [email protected]> wrote:
> >>>>>
> >>>>> Hi Authors,
> >>>>>
> >>>>> This is a friendly weekly reminder that we await content approvals
> from Christopher, Kazuho, and Eric before moving along with formatting
> updates for this document.
> >>>>>
> >>>>> Thank you!
> >>>>>
> >>>>> Madison Church
> >>>>> RFC Production Center
> >>>>>
> >>>>>> On Jan 17, 2026, at 6:37 PM, Eric Rescorla <[email protected]> wrote:
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>> On Fri, Jan 16, 2026 at 2:37 PM Madison Church <
> [email protected]> wrote:
> >>>>>> Hi All,
> >>>>>>
> >>>>>> Paul - We have noted your approvals for the two proposed technical
> changes.
> >>>>>>
> >>>>>> Nick - Thank you for your reply! We have noted your approval for
> the contents of this document on the AUTH48 status page and implemented
> your requested updates. The diff file was incredibly helpful!
> >>>>>>
> >>>>>> We will wait for confirmation to implement the technical changes.
> >>>>>>
> >>>>>> I will implement the technical changes in my copy.
> >>>>>>
> >>>>>> -Ekr
> >>>>>>
> >>>>>> Please review the contents of the document carefully. Contact us
> with any further updates or with your approval of the document’s contents
> in its current form. Once we receive approvals from Christopher, Kazuho,
> and Eric, we will move forward with formatting updates.
> >>>>>>
> >>>>>> For details of the AUTH48 process in kramdown-rfc (including the
> two-part approval process), see
> https://www.rfc-editor.org/rpc/wiki/doku.php?id=pilot_test_kramdown_rfc.
> >>>>>>
> >>>>>> The files have been posted here (please refresh):
> >>>>>> https://www.rfc-editor.org/authors/rfc9849.txt
> >>>>>> https://www.rfc-editor.org/authors/rfc9849.pdf
> >>>>>> https://www.rfc-editor.org/authors/rfc9849.html
> >>>>>>
> >>>>>> Markdown file:
> >>>>>> https://www.rfc-editor.org/authors/rfc9849.md
> >>>>>>
> >>>>>> The relevant diff files have been posted here (please refresh):
> >>>>>> https://www.rfc-editor.org/authors/rfc9849-diff.html
> (comprehensive diff)
> >>>>>> https://www.rfc-editor.org/authors/rfc9849-rfcdiff.html (side by
> side)
> >>>>>> https://www.rfc-editor.org/authors/rfc9849-auth48diff.html (diff
> showing AUTH48 changes)
> >>>>>> https://www.rfc-editor.org/authors/rfc9849-auth48rfcdiff.html
> (side by side)
> >>>>>>
> >>>>>> Markdown diffs:
> >>>>>> https://www.rfc-editor.org/authors/rfc9849-md-diff.html
> >>>>>> https://www.rfc-editor.org/authors/rfc9849-md-rfcdiff.html
> >>>>>> https://www.rfc-editor.org/authors/rfc9849-md-auth48diff.html
> >>>>>> https://www.rfc-editor.org/authors/rfc9849-md-auth48rfcdiff.html
> >>>>>>
> >>>>>> For the AUTH48 status of this document, please see:
> >>>>>> https://www.rfc-editor.org/auth48/rfc9849
> >>>>>>
> >>>>>> Thank you,
> >>>>>> Madison Church
> >>>>>> RFC Production Center
> >>>>>>
> >>>>>>> On Jan 14, 2026, at 9:42 AM, Nick Sullivan <
> [email protected]> wrote:
> >>>>>>>
> >>>>>>> Hello RFC Production Center,
> >>>>>>>
> >>>>>>> I reviewed the currently posted AUTH48 text for RFC-to-be 9849
> >>>>>>> (rfc9849.txt on the RFC Editor authors page). Below are a small
> set of
> >>>>>>> remaining editorial issues.
> >>>>>>>
> >>>>>>> Two items that are technically non-editorial are already being
> handled
> >>>>>>> in the TLS WG GitHub repository (issues 656 and 665 / corresponding
> >>>>>>> open PRs). To avoid duplication, I am not requesting those changes
> >>>>>>> here or requesting any expansion of RFC number placeholders (for
> >>>>>>> example RFCYYY1) in this note.
> >>>>>>>
> >>>>>>> A) Typos and minor editorial fixes (no intended technical change)
> >>>>>>>
> >>>>>>> Section 5.1 (Encoding the ClientHelloInner)
> >>>>>>> - Replace “structured defined” with “structure defined”.
> >>>>>>> Section 6.1 (Offering ECH)
> >>>>>>> - Capitalization: “Instead, It MUST …” -> “Instead, it MUST …”.
> >>>>>>> Section 7 (Server Behavior introduction)
> >>>>>>> - Consistency: “back-end server” -> “backend server”.
> >>>>>>> Section 10.8 (Cookies)
> >>>>>>> - Insert missing space: “unencrypted.This” -> “unencrypted. This”.
> >>>>>>> Section 11.3 (ECH Configuration Extension Registry)
> >>>>>>> - Fix grammar in the “Recommended” field description and remove
> >>>>>>> duplicated wording (“value with a value of”).
> >>>>>>>
> >>>>>>> Proposed patch (unified diff against the currently posted
> rfc9849.txt;
> >>>>>>> excludes items already covered by issues 656 and 665; no RFC
> >>>>>>> placeholder expansions)
> >>>>>>>
> >>>>>>> ```
> >>>>>>> --- rfc9849.txt
> >>>>>>> +++ rfc9849.txt
> >>>>>>> @@ -521,7 +521,7 @@
> >>>>>>> -        structured defined in Section 5.3 of [RFC9147].  This
> does not
> >>>>>>> +        structure defined in Section 5.3 of [RFC9147].  This does
> not
> >>>>>>>
> >>>>>>> @@ -675,7 +675,7 @@
> >>>>>>> -            ClientHelloInner.random.  Instead, It MUST generate a
> fresh
> >>>>>>> +            ClientHelloInner.random.  Instead, it MUST generate a
> fresh
> >>>>>>>
> >>>>>>> @@ -1129,7 +1129,7 @@
> >>>>>>> -        the client-facing server or as the back-end server.
> Depending on the
> >>>>>>> +        the client-facing server or as the backend server.
> Depending on the
> >>>>>>>
> >>>>>>> @@ -1706,7 +1706,7 @@
> >>>>>>> -        unencrypted.This means differences in cookies between
> backend
> >>>>>>> +        unencrypted. This means differences in cookies between
> backend
> >>>>>>>
> >>>>>>> @@ -2114,13 +2114,12 @@
> >>>>>>> -   Recommended:  A "Y" or "N" value indicating if the extension
> is TLS
> >>>>>>> -      WG recommends that the extension be supported.  This column
> is
> >>>>>>> -      assigned a value of "N" unless explicitly requested.
> Adding a
> >>>>>>> -      value with a value of "Y" requires Standards Action
> [RFC8126].
> >>>>>>> +   Recommended:  A "Y" or "N" value indicating if the TLS Working
> Group
> >>>>>>> +      recommends that the extension be supported.  This column is
> assigned a
> >>>>>>> +      value of "N" unless explicitly requested.  Adding a value
> of "Y"
> >>>>>>> +      requires Standards Action [RFC8126].
> >>>>>>> ```
> >>>>>>>
> >>>>>>> GitHub PR:
> https://github.com/tlswg/draft-ietf-tls-esni/pull/671/files
> >>>>>>>
> >>>>>>> With these changes, the publication is approved by me.
> >>>>>>>
> >>>>>>> Thank you,
> >>>>>>> Nick Sullivan
> >>>>>>>
> >>>>>>>
> >>>>>>> On Mon, Jan 12, 2026 at 12:28 PM Nick Sullivan
> >>>>>>> <[email protected]> wrote:
> >>>>>>>>
> >>>>>>>> Hi Madison,
> >>>>>>>>
> >>>>>>>> Apologies for the delay, I was intending to do this over the new
> year but didn't get to it. I'll review by end of week.
> >>>>>>>>
> >>>>>>>> Best,
> >>>>>>>> Nick
> >>>>>>>>
> >>>>>>>> On Fri, Jan 9, 2026 at 10:31 AM Paul Wouters <
> [email protected]> wrote:
> >>>>>>>>>
> >>>>>>>>> approved (via email and at the PRs listed)
> >>>>>>>>>
> >>>>>>>>> Paul
> >>>>>>>>>
> >>>>>>>>> On Thu, Jan 8, 2026 at 4:49 PM Madison Church <
> [email protected]> wrote:
> >>>>>>>>>>
> >>>>>>>>>> Hi Authors, *Paul,
> >>>>>>>>>>
> >>>>>>>>>> Happy new year!
> >>>>>>>>>>
> >>>>>>>>>> This is a friendly reminder that we have yet to hear back from
> you regarding the readiness of this document’s contents before moving
> forward with formatting updates.
> >>>>>>>>>>
> >>>>>>>>>> *Paul - As responsible AD for this document, please review the
> changes below and let us know if you approve:
> >>>>>>>>>> https://github.com/tlswg/draft-ietf-tls-esni/pull/668
> >>>>>>>>>> https://github.com/tlswg/draft-ietf-tls-esni/pull/667
> >>>>>>>>>>
> >>>>>>>>>> For the AUTH48 status page, see:
> https://www.rfc-editor.org/auth48/rfc9849.
> >>>>>>>>>>
> >>>>>>>>>> Thank you!
> >>>>>>>>>> Madison Church
> >>>>>>>>>> RFC Production Center
> >>>>>>>>>>
> >>>>>>>>>>
> >>>>>>>>>>> On Dec 18, 2025, at 12:46 PM, Madison Church <
> [email protected]> wrote:
> >>>>>>>>>>>
> >>>>>>>>>>> Hi Eric,
> >>>>>>>>>>>
> >>>>>>>>>>> Thank you for the followup! We have updated the AUTH48 status
> page (https://www.rfc-editor.org/auth48/rfc9849) and we will wait to hear
> from you once you complete your final content review.
> >>>>>>>>>>>
> >>>>>>>>>>> Madison Church
> >>>>>>>>>>> RFC Production Center
> >>>>>>>>>>>
> >>>>>>>>>>>> On Dec 18, 2025, at 12:33 PM, Eric Rescorla <[email protected]>
> wrote:
> >>>>>>>>>>>>
> >>>>>>>>>>>> FWIW I think Paul actually just approved this one change, not
> the overall RFC.
> >>>>>>>>>>>>
> >>>>>>>>>>>> I have merged this markdown file into the version on GitHub.
> There are two pending
> >>>>>>>>>>>> changes that are technically not just editorial, though I
> think obvious and need Paul's
> >>>>>>>>>>>> approval:
> >>>>>>>>>>>>
> >>>>>>>>>>>> https://github.com/tlswg/draft-ietf-tls-esni/pull/668
> >>>>>>>>>>>> https://github.com/tlswg/draft-ietf-tls-esni/pull/667
> >>>>>>>>>>>>
> >>>>>>>>>>>> In parallel, I will also need to give it a final
> top-to-bottom read, which I hope to do in the next
> >>>>>>>>>>>> week or so.
> >>>>>>>>>>>>
> >>>>>>>>>>>> -Ekr
> >>>>>>>>>>>>
> >>>>>>>>>>>>
> >>>>>>>>>>>>
> >>>>>>>>>>>>
> >>>>>>>>>>>> On Thu, Dec 18, 2025 at 9:42 AM Madison Church <
> [email protected]> wrote:
> >>>>>>>>>>>> Hi Paul,
> >>>>>>>>>>>>
> >>>>>>>>>>>> We have marked your approval on the AUTH48 status page (see
> https://www.rfc-editor.org/auth48/rfc9849).
> >>>>>>>>>>>>
> >>>>>>>>>>>> Thanks!
> >>>>>>>>>>>>
> >>>>>>>>>>>> Madison Church
> >>>>>>>>>>>> RFC Production Center
> >>>>>>>>>>>>
> >>>>>>>>>>>>> On Dec 18, 2025, at 11:27 AM, Paul Wouters <
> [email protected]> wrote:
> >>>>>>>>>>>>>
> >>>>>>>>>>>>>
> >>>>>>>>>>>>>
> >>>>>>>>>>>>>
> >>>>>>>>>>>>>> On Dec 18, 2025, at 11:06, Madison Church <
> [email protected]> wrote:
> >>>>>>>>>>>>>>
> >>>>>>>>>>>>>> Hi Authors, *Paul,
> >>>>>>>>>>>>>>
> >>>>>>>>>>>>>> *Paul - As responsible AD, please note that we await your
> approval of RFC YYY1 as an Informative Reference (changed from Normative to
> Informative).
> >>>>>>>>>>>>>
> >>>>>>>>>>>>> approved
> >>>>>>>>>>>>>
> >>>>>>>>>>>>> Paul
> >>>>>>>>>>>>>
> >>>>>>>>>>>>>>
> >>>>>>>>>>>>>> Authors - This is a friendly reminder that we await
> approvals from each author prior to moving forward with formatting updates.
> >>>>>>>>>>>>>>
> >>>>>>>>>>>>>> For details of the AUTH48 process in kramdown-rfc
> (including the two-part approval process), see
> https://www.rfc-editor.org/rpc/wiki/doku.php?id=pilot_test_kramdown_rfc.
> >>>>>>>>>>>>>>
> >>>>>>>>>>>>>> The files have been posted here (please refresh):
> >>>>>>>>>>>>>> https://www.rfc-editor.org/authors/rfc9849.txt
> >>>>>>>>>>>>>> https://www.rfc-editor.org/authors/rfc9849.pdf
> >>>>>>>>>>>>>> https://www.rfc-editor.org/authors/rfc9849.html
> >>>>>>>>>>>>>>
> >>>>>>>>>>>>>> Markdown file:
> >>>>>>>>>>>>>> https://www.rfc-editor.org/authors/rfc9849.md
> >>>>>>>>>>>>>>
> >>>>>>>>>>>>>> The relevant diff files have been posted here (please
> refresh):
> >>>>>>>>>>>>>> https://www.rfc-editor.org/authors/rfc9849-diff.html
> (comprehensive diff)
> >>>>>>>>>>>>>> https://www.rfc-editor.org/authors/rfc9849-rfcdiff.html
> (side by side)
> >>>>>>>>>>>>>> https://www.rfc-editor.org/authors/rfc9849-auth48diff.html
> (diff showing AUTH48 changes)
> >>>>>>>>>>>>>>
> https://www.rfc-editor.org/authors/rfc9849-auth48rfcdiff.html (side by
> side)
> >>>>>>>>>>>>>>
> >>>>>>>>>>>>>> Markdown diffs:
> >>>>>>>>>>>>>> https://www.rfc-editor.org/authors/rfc9849-md-diff.html
> >>>>>>>>>>>>>> https://www.rfc-editor.org/authors/rfc9849-md-rfcdiff.html
> >>>>>>>>>>>>>>
> https://www.rfc-editor.org/authors/rfc9849-md-auth48diff.html
> >>>>>>>>>>>>>>
> https://www.rfc-editor.org/authors/rfc9849-md-auth48rfcdiff.html
> >>>>>>>>>>>>>>
> >>>>>>>>>>>>>> For the AUTH48 status of this document, please see:
> >>>>>>>>>>>>>> https://www.rfc-editor.org/auth48/rfc9849
> >>>>>>>>>>>>>>
> >>>>>>>>>>>>>> Thank you,
> >>>>>>>>>>>>>>
> >>>>>>>>>>>>>> Madison Church
> >>>>>>>>>>>>>> RFC Production Center
> >>>>>>>>>>>>>>
> >>>>>>>>>>>>>>> On Dec 11, 2025, at 10:07 AM, Madison Church <
> [email protected]> wrote:
> >>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>> Hi Eric, *Paul,
> >>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>> Eric - Thank you for your reply! We weren’t sure if this
> was intentional, so thank you for clarifying. We have moved RFC YYY1 to the
> Informative References section.
> >>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>> *Paul - As responsible AD, please let us know if you
> approve RFC YYY1 as an Informative Reference.
> >>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>> Please review the contents of the document carefully.
> Contact us with any further updates or with your approval of the document’s
> contents in its current form. We will await approvals from each author
> prior to moving forward with formatting updates.
> >>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>> For details of the AUTH48 process in kramdown-rfc
> (including the two-part approval process), see
> https://www.rfc-editor.org/rpc/wiki/doku.php?id=pilot_test_kramdown_rfc.
> >>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>> The files have been posted here (please refresh):
> >>>>>>>>>>>>>>> https://www.rfc-editor.org/authors/rfc9849.txt
> >>>>>>>>>>>>>>> https://www.rfc-editor.org/authors/rfc9849.pdf
> >>>>>>>>>>>>>>> https://www.rfc-editor.org/authors/rfc9849.html
> >>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>> Markdown file:
> >>>>>>>>>>>>>>> https://www.rfc-editor.org/authors/rfc9849.md
> >>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>> The relevant diff files have been posted here (please
> refresh):
> >>>>>>>>>>>>>>> https://www.rfc-editor.org/authors/rfc9849-diff.html
> (comprehensive diff)
> >>>>>>>>>>>>>>> https://www.rfc-editor.org/authors/rfc9849-rfcdiff.html
> (side by side)
> >>>>>>>>>>>>>>> https://www.rfc-editor.org/authors/rfc9849-auth48diff.html
> (diff showing AUTH48 changes)
> >>>>>>>>>>>>>>>
> https://www.rfc-editor.org/authors/rfc9849-auth48rfcdiff.html (side by
> side)
> >>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>> Markdown diffs:
> >>>>>>>>>>>>>>> https://www.rfc-editor.org/authors/rfc9849-md-diff.html
> >>>>>>>>>>>>>>> https://www.rfc-editor.org/authors/rfc9849-md-rfcdiff.html
> >>>>>>>>>>>>>>>
> https://www.rfc-editor.org/authors/rfc9849-md-auth48diff.html
> >>>>>>>>>>>>>>>
> https://www.rfc-editor.org/authors/rfc9849-md-auth48rfcdiff.html
> >>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>> For the AUTH48 status of this document, please see:
> >>>>>>>>>>>>>>> https://www.rfc-editor.org/auth48/rfc9849
> >>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>> Thank you,
> >>>>>>>>>>>>>>> Madison Church
> >>>>>>>>>>>>>>> RFC Production Center
> >>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>> On Dec 5, 2025, at 4:38 PM, Eric Rescorla <[email protected]>
> wrote:
> >>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>> Hi Madison,
> >>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>> I believe that the citation to RFCYYY1 should be
> informative, not normative. I corrected that in
> >>>>>>>>>>>>>>>> my version but I guess I forgot to flag it. Paul,
> co-authors, any objections?
> >>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>> -Ekr
> >>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>> On Fri, Dec 5, 2025 at 2:16 PM Madison Church <
> [email protected]> wrote:
> >>>>>>>>>>>>>>>> Hi Eric,
> >>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>> Thank you for the updated markdown file! We have
> incorporated your edits into the document. Upon further review, we have
> also updated the term "Shared Mode" to follow the same pattern as "Split
> Mode" (uppercase on first use and in titles, lowercase otherwise). Please
> let us know any objections. Additionally, we will update the WHATWG
> reference per our discussion during formatting. Aside from the updates
> mentioned, we have no further questions/comments at this time.
> >>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>> Please review the contents of the document carefully.
> Contact us with any further updates or with your approval of the document’s
> contents in its current form. We will await approvals from each author
> prior to moving forward with formatting updates.
> >>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>> For details of the AUTH48 process in kramdown-rfc
> (including the two-part approval process), see
> https://www.rfc-editor.org/rpc/wiki/doku.php?id=pilot_test_kramdown_rfc.
> >>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>> The files have been posted here (please refresh):
> >>>>>>>>>>>>>>>> https://www.rfc-editor.org/authors/rfc9849.txt
> >>>>>>>>>>>>>>>> https://www.rfc-editor.org/authors/rfc9849.pdf
> >>>>>>>>>>>>>>>> https://www.rfc-editor.org/authors/rfc9849.html
> >>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>> Markdown file:
> >>>>>>>>>>>>>>>> https://www.rfc-editor.org/authors/rfc9849.md
> >>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>> The relevant diff files have been posted here (please
> refresh):
> >>>>>>>>>>>>>>>> https://www.rfc-editor.org/authors/rfc9849-diff.html
> (comprehensive diff)
> >>>>>>>>>>>>>>>> https://www.rfc-editor.org/authors/rfc9849-rfcdiff.html
> (side by side)
> >>>>>>>>>>>>>>>>
> https://www.rfc-editor.org/authors/rfc9849-auth48diff.html (diff showing
> AUTH48 changes)
> >>>>>>>>>>>>>>>>
> https://www.rfc-editor.org/authors/rfc9849-auth48rfcdiff.html (side by
> side)
> >>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>> Markdown diffs:
> >>>>>>>>>>>>>>>> https://www.rfc-editor.org/authors/rfc9849-md-diff.html
> >>>>>>>>>>>>>>>>
> https://www.rfc-editor.org/authors/rfc9849-md-rfcdiff.html
> >>>>>>>>>>>>>>>>
> https://www.rfc-editor.org/authors/rfc9849-md-auth48diff.html
> >>>>>>>>>>>>>>>>
> https://www.rfc-editor.org/authors/rfc9849-md-auth48rfcdiff.html
> >>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>> For the AUTH48 status of this document, please see:
> >>>>>>>>>>>>>>>> https://www.rfc-editor.org/auth48/rfc9849
> >>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>> Thank you,
> >>>>>>>>>>>>>>>> Madison Church
> >>>>>>>>>>>>>>>> RFC Production Center
> >>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>> On Dec 4, 2025, at 7:12 PM, Eric Rescorla <[email protected]>
> wrote:
> >>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>> Here is an updated markdown file with the fixed width
> adjustments.
> >>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>
> https://raw.githubusercontent.com/tlswg/draft-ietf-tls-esni/refs/heads/auth48/rfc9849.md
> >>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>> -Ekr
> >>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>> On Wed, Dec 3, 2025 at 9:49 AM Eric Rescorla <
> [email protected]> wrote:
> >>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>> On Wed, Dec 3, 2025 at 6:23 AM Madison Church <
> [email protected]> wrote:
> >>>>>>>>>>>>>>>>> Hi Eric,
> >>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>> Thank you for your reply! Please see inline.
> >>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>> On Dec 2, 2025, at 1:38 PM, Eric Rescorla <[email protected]>
> wrote:
> >>>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>> Thanks.
> >>>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>> Re the questions and comments:
> >>>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>> * I will send a revised file with the fixed width
> issues fixed
> >>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>> Noted!
> >>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>> * As I understand the WHATWG question, there are two
> distinct issues (1) whether to reference a commit and (2) whether to
> reference fragments. I'm OK with referencing a commit like this if that's
> what you agreed with WHATWG, but I read this text as saying not to
> reference fragments unless we ensure that the anchor is permanent
> https://whatwg.org/working-mode#anchors. Have we done so for this one?
> >>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>> Thank you for clarifying. We are unsure if the current
> anchor [1] is permanent, so we would recommend not using it and using the
> more general one [2]. However, if any other authors put in a request with
> WHATWG to make that anchor permanent, please let us know.
> >>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>> [1] https://url.spec.whatwg.org/#concept-ipv4-parser
> >>>>>>>>>>>>>>>>> [2] https://url.spec.whatwg.org/
> >>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>> I think we are in agreement, then, thanks.
> >>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>> -Ekr
> >>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>> Thank you!
> >>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>> Madison Church
> >>>>>>>>>>>>>>>>> RFC Production Center
> >>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>> -Ekr
> >>>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>> On Tue, Dec 2, 2025 at 6:58 AM Madison Church <
> [email protected]> wrote:
> >>>>>>>>>>>>>>>>>> Hi Authors,
> >>>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>> This is a friendly weekly reminder that we await
> answers to the followup questions/comments below and your review of the
> document before continuing with the publication process. For details of the
> AUTH48 process in kramdown-rfc (including the two-part approval process),
> see:
> https://www.rfc-editor.org/rpc/wiki/doku.php?id=pilot_test_kramdown_rfc.
> >>>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>> Thank you!
> >>>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>> Madison Church
> >>>>>>>>>>>>>>>>>> RFC Production Center
> >>>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>>> On Nov 25, 2025, at 8:34 AM, Madison Church <
> [email protected]> wrote:
> >>>>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>>> Hi Eric,
> >>>>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>>> Thank you for your reply! We have updated the document
> as requested and have two followup items for your review, which can be
> viewed in the AUTH48 thread below or in the updated markdown file marked
> with "rfced".
> >>>>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>>>> On Nov 20, 2025, at 10:33 PM, Eric Rescorla <
> [email protected]> wrote:
> >>>>>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>>>> Update: I fixed my affiliation.
> >>>>>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>>>> On Thu, Nov 20, 2025 at 8:23 PM Eric Rescorla <
> [email protected]> wrote:
> >>>>>>>>>>>>>>>>>>>> Thank you. I am editing this in GitHub. I merged in
> your proposed changes except
> >>>>>>>>>>>>>>>>>>>> for those I think are inadvisable, which I reverted.
> I answered your questions inline.
> >>>>>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>>>> You can find the latest markdown file here (also
> attached):
> >>>>>>>>>>>>>>>>>>>>
> https://raw.githubusercontent.com/tlswg/draft-ietf-tls-esni/refs/heads/auth48/rfc9849.md
> >>>>>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>>>> -Ekr
> >>>>>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>>>>> On Fri, Nov 14, 2025 at 10:53 AM <
> [email protected]> wrote:
> >>>>>>>>>>>>>>>>>>>>> Authors,
> >>>>>>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>>>>> While reviewing this document during AUTH48, please
> resolve (as necessary) the following questions, which are also in the
> source file.
> >>>>>>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>>>>> 1) <!-- [rfced] References
> >>>>>>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>>>>> a) Regarding [WHATWG-IPV4], this reference's date is
> May 2021.
> >>>>>>>>>>>>>>>>>>>>> The URL provided resolves to a page with "Last
> Updated 12 May 2025".
> >>>>>>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>>>>> Note that WHATWG provides "commit snapshots" of
> their living standards and
> >>>>>>>>>>>>>>>>>>>>> there are several commit snapshots from May 2021
> with the latest being from 20
> >>>>>>>>>>>>>>>>>>>>> May 2021. For example: 20 May 2021
> >>>>>>>>>>>>>>>>>>>>> (
> https://url.spec.whatwg.org/commit-snapshots/1b8b8c55eb4bed9f139c9a439fb1c1bf5566b619/#concept-ipv4-parser
> )
> >>>>>>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>>>>> We recommend updating this reference to the most
> current version of the WHATWG
> >>>>>>>>>>>>>>>>>>>>> Living Standard, replacing the URL with the more
> general URL to the standard
> >>>>>>>>>>>>>>>>>>>>> (https://url.spec.whatwg.org/), and adding a
> "commit snapshot" URL to the
> >>>>>>>>>>>>>>>>>>>>> reference.
> >>>>>>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>>>>> Current:
> >>>>>>>>>>>>>>>>>>>>> [WHATWG-IPV4]
> >>>>>>>>>>>>>>>>>>>>>   WHATWG, "URL - IPv4 Parser", WHATWG Living
> Standard, May
> >>>>>>>>>>>>>>>>>>>>>    2021, <
> https://url.spec.whatwg.org/#concept-ipv4-parser>.
> >>>>>>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>>>>> EKR: Per MT, WHATWG has asked us not to do that. We
> should leave
> >>>>>>>>>>>>>>>>>>>>> this as-is and change the date to December 2025.
> >>>>>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>>>> 1) For context, we reached out to WHATWG in September
> about a format for references to their standards (see:
> https://github.com/whatwg/meta/issues/363). The proposed update below for
> this reference reflects the approved format. It would be helpful for the
> RPC to know what WHATWG has asked authors to not do so that we can reach
> out for clarification and update our recommended citation if necessary.
> With this in mind, let us know if any updates need to be made.
> >>>>>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>>>> Perhaps:
> >>>>>>>>>>>>>>>>>>>> [WHATWG-IPV4]
> >>>>>>>>>>>>>>>>>>>>   WHATWG, "URL - IPv4 Parser", WHATWG Living Standard,
> >>>>>>>>>>>>>>>>>>>>   <https://url.spec.whatwg.org/#concept-ipv4-parser>.
> >>>>>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>>>>   Commit snapshot:
> >>>>>>>>>>>>>>>>>>>>
> https://url.spec.whatwg.org/commit-snapshots/1b8b8c55eb4bed9f139c9a439fb1c1bf5566b619/#concept-ipv4-parser
> >>>>>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>>>> Regarding the date, we don't recommend using a future
> date for a reference as it doesn't reflect the date for a currently
> published work (unless there is an anticipated update to the WHATWG
> specification in December 2025).
> >>>>>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>>>>> d) FYI, RFCYYY1 (draft-ietf-tls-svcb-ech) will be
> updated during the XML stage.
> >>>>>>>>>>>>>>>>>>>>> -->
> >>>>>>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>>>>> 7) <!-- [rfced] We note that the following terms use
> fixed-width font
> >>>>>>>>>>>>>>>>>>>>> inconsistently. Please review these terms and let us
> know how we should update
> >>>>>>>>>>>>>>>>>>>>> or if there are any specific patterns that should be
> followed (e.g.,
> >>>>>>>>>>>>>>>>>>>>> fixed-width font used for field names, variants,
> etc.).
> >>>>>>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>>>>> accept_confirmation
> >>>>>>>>>>>>>>>>>>>>> cipher_suite
> >>>>>>>>>>>>>>>>>>>>> ClientHello
> >>>>>>>>>>>>>>>>>>>>> ClientHelloInner
> >>>>>>>>>>>>>>>>>>>>> ClientHelloOuter
> >>>>>>>>>>>>>>>>>>>>> ClientHelloOuterAAD
> >>>>>>>>>>>>>>>>>>>>> config_id
> >>>>>>>>>>>>>>>>>>>>> ECHClientHello
> >>>>>>>>>>>>>>>>>>>>> ECHConfig
> >>>>>>>>>>>>>>>>>>>>> ECHConfig.contents.public_name
> >>>>>>>>>>>>>>>>>>>>> ECHConfigContents
> >>>>>>>>>>>>>>>>>>>>> ECHConfigList
> >>>>>>>>>>>>>>>>>>>>> EncodedClientHelloInner
> >>>>>>>>>>>>>>>>>>>>> inner
> >>>>>>>>>>>>>>>>>>>>> maximum_name_length
> >>>>>>>>>>>>>>>>>>>>> outer
> >>>>>>>>>>>>>>>>>>>>> payload
> >>>>>>>>>>>>>>>>>>>>> public_key
> >>>>>>>>>>>>>>>>>>>>> ServerHello.random
> >>>>>>>>>>>>>>>>>>>>> zeros
> >>>>>>>>>>>>>>>>>>>>> —>
> >>>>>>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>>>>> EKR: Thanks. Fixed width should be used for field
> names and other PDUs.
> >>>>>>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>>>>> I notice that some of these are regular words
> (zeros) so you have to determine from context whether it's referring to
> some protocol element or just to the concept "carries an encrypted payload"
> versus "the payload field". Do you want to take a cut at changing as many
> of these as make sense and then I can review, or would you prefer I make
> the changes?
> >>>>>>>>>>>>>>>>>>>>> One question is what to do in definition lists. My
> sense is that the list heds should be non-fixed-width but maybe you have a
> convention.
> >>>>>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>>>> 2) Thank you for offering to make changes. Please
> feel free to attach an updated markdown file containing the changes for
> terms using fixed-width font.
> >>>>>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>>>> For definition lists, we typically leave this up to
> the authors to determine how they would like the terms to appear for
> consistency. For an example of terms in a definition list using a
> fixed-width font, see:
> https://www.rfc-editor.org/rfc/rfc9623.html#section-5.1.1.
> >>>>>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>>>> The files have been posted here (please refresh):
> >>>>>>>>>>>>>>>>>>>> https://www.rfc-editor.org/authors/rfc9849.txt
> >>>>>>>>>>>>>>>>>>>> https://www.rfc-editor.org/authors/rfc9849.pdf
> >>>>>>>>>>>>>>>>>>>> https://www.rfc-editor.org/authors/rfc9849.html
> >>>>>>>>>>>>>>>>>>>> https://www.rfc-editor.org/authors/rfc9849.xml
> >>>>>>>>>>>>>>>>>>>> https://www.rfc-editor.org/authors/rfc9849.md
> >>>>>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>>>> The relevant diff files have been posted here (please
> refresh):
> >>>>>>>>>>>>>>>>>>>> https://www.rfc-editor.org/authors/rfc9849-diff.html
> >>>>>>>>>>>>>>>>>>>>
> https://www.rfc-editor.org/authors/rfc9849-rfcdiff.html (side by side)
> >>>>>>>>>>>>>>>>>>>>
> https://www.rfc-editor.org/authors/rfc9849-auth48diff.html
> >>>>>>>>>>>>>>>>>>>>
> https://www.rfc-editor.org/authors/rfc9849-auth48rfcdiff.html (side by
> side)
> >>>>>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>>>> Markdown diffs:
> >>>>>>>>>>>>>>>>>>>>
> https://www.rfc-editor.org/authors/rfc9849-md-diff.html
> >>>>>>>>>>>>>>>>>>>>
> https://www.rfc-editor.org/authors/rfc9849-md-rfcdiff.html
> >>>>>>>>>>>>>>>>>>>>
> https://www.rfc-editor.org/authors/rfc9849-md-auth48diff.html
> >>>>>>>>>>>>>>>>>>>>
> https://www.rfc-editor.org/authors/rfc9849-md-auth48rfcdiff.html
> >>>>>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>>>> For the AUTH48 status of this document, please see:
> https://www.rfc-editor.org/auth48/rfc9849.
> >>>>>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>>>> We will await approvals from each author prior to
> moving forward with formatting updates. For details of the AUTH48 process
> in kramdown-rfc (including the two-part approval process), see:
> https://www.rfc-editor.org/rpc/wiki/doku.php?id=pilot_test_kramdown_rfc.
> >>>>>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>>>> Thank you!
> >>>>>>>>>>>>>>>>>>>>
> >>>>>>>>>>>>>>>>>>>> Madison Church
> >>>>>>>>>>>>>>>>>>>> RFC Production Center
> >>>>>>
> >>>>>
> >>>
> >>
> >>
> >> --
> >> Kazuho Oku
> >> <rfc9849.txt.kazuho.diff>
> >
>
>
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