Re: [hybi] [Technical Errata Reported] RFC7692 (4982)

Moonchild <moonchild@palemoon.org> Tue, 28 March 2017 20:21 UTC

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To: Takeshi Yoshino <tyoshino@google.com>, RFC Errata System <rfc-editor@rfc-editor.org>
References: <20170328105256.E5282B8128B@rfc-editor.org> <CAH9hSJZczOmsDPo-7gmTxWLtzE=VKXFFoh20OVWQtvNeCKz=mg@mail.gmail.com>
Cc: Ben Campbell <ben@nostrum.com>, alissa@cooperw.in, aamelnikov@fastmail.fm, Salvatore Loreto <Salvatore.Loreto@ericsson.com>, Gabriel Montenegro <Gabriel.Montenegro@microsoft.com>, "hybi@ietf.org" <hybi@ietf.org>
From: Moonchild <moonchild@palemoon.org>
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Date: Tue, 28 Mar 2017 22:20:07 +0200
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Subject: Re: [hybi] [Technical Errata Reported] RFC7692 (4982)
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On 28/03/2017 14:57, Takeshi Yoshino wrote:
> For consistency with other paragraphs, we could also rewrite the
> paragraphs as follows.
> 
> A server MAY ... response _as a hint_ even if ...
> 
> A client MUST support the "server_no_context_takeover" extension
> parameter in an extension negotiation response regardless of whether or
> not the client may include the "server_no_context_takeover" extension
> parameter in an extension negotiation offer.
>  

I think you have to be careful here that you're not going to imply that
a client must support the parameter in its implementation, but merely
that the parameter as part of a response must be *accepted* (but may be
ignored if no implementation is being provided to back this parameter)
as part of a valid configuration. That is why I suggested my initial
errata wording as I did in the corrected text.

I also agree that the exact same rationale applies to 7.1.2.1
"server_max_window_bits" since that can also be sent unsolicited by the
server to a client, even if the client may not support that functionality.