Hey Watson,

Apologies if I should respond directly to the mailing list - my old W3C profile 
has disappeared and I'm trying to get it back...

If the consensus is that the SETTINGS frame is the best place for it, that's 
fine. Initially I decided on a new TLS extension because it seemed simpler and 
I didn't want to mess with SETTINGS.

I agree that it will require both a new registry and updating it will probably 
be under the purview of the HTTP WG - as you say, a once-in-a-while RFC or 
similar.

Note that the original QPACK header analysis was done in 2018 - that's 5 
(almost 6!) years ago - a lifetime in the world of the internet. If I were to 
do similar analysis today, it would be clear that there are some very common 
headers in use which barely existed back then - for example, all the Client 
Hints headers.

Primarily this isn't about specific headers - it's about future proofing. If 
*something* isn't implemented, then we're at risk either of companies coming up 
with their own QPACK static tables (which only work with *their* client 
devices/servers) or a sub-performant scenario where common headers are 
relegated to the QPACK dynamic table.

Thanks,

Rory

-----Original Message-----
From: Watson Ladd <watsonbl...@gmail.com> 
Sent: Monday, September 25, 2023 10:08 PM
To: Hewitt, Rory <rhew...@akamai.com>
Cc: HTTP Working Group <ietf-http...@w3.org>; TLS List <tls@ietf.org>; Bishop, 
Mike <mbis...@akamai.com>
Subject: Re: [TLS] New Internet Draft: The qpack_static_table_version TLS 
extension

On Mon, Sep 25, 2023, 2:44 PM Hewitt, Rory 
<rhewitt=40akamai....@dmarc.ietf.org> wrote:
>
> Dear HTTP-BIS & TLS folks,
<snip>

> I would appreciate any comments, positive or negative.

Rory,

Great to see someone new jump in and the text is pretty clear. I do have one 
question: why not use the SETTINGS frame? This seems like it would fit there. 
Also I think IANA isn't equipped to perform that analysis, but it's something 
the HTTP WG could do and periodically publish a very boring RFC for, or maybe 
even abuse expert review in the IANA process to get the changes done. I do 
think something like this is worthwhile in principle, but I wouldn't be 
surprised if the analysis comes back "HTTP usages haven't changed enough" for a 
bit.

Sincerely,
Watson Ladd
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