[ech] custom TLS client hello extensions

[Stephen Farrell]

Hiya,

On 02/03/2023 18:08, David Benjamin wrote:
> No. We removed it because we decided, per that discussion thread,
> that they weren't a good idea given an evolving TLS protocol. Case in
> point, this discussion. :-)

Fair 'nuff. I think that, and as Rich point out, browsers
not using custom extensions, strengthens the argument to
do the minimum, for now at least, assuming evidence for
doing more doesn't turn up.

Cheers,
S.
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