[ech] custom TLS client hello extensions

[Stephen Farrell]

Hiya,

On 03/03/2023 09:45, Matt Caswell wrote:
> 
> I think the main use case that I'm aware of for custom extensions is to 
> support signed_certificate_timestamp. There's no direct built-in support 
> for that but its straight forward to add it via a "serverinfo" file 
> which uses the custom extensions API.
> 
> As previously mentioned we're using it internally for quic transport 
> parameters.

So, I don't think there's any sensitivity with that CH
extension, which again seems to argue for an initial
approach of just compressing all custom exts within the
inner CH.

Cheers,
S.
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