Re: [quicwg/base-drafts] Authenticate connection IDs (#3499)

[David Schinazi <[e-mail]>]

I like @huitema's deployment plan. I think it would be valuable to get deployment experience of these new transport parameters in draft-27 so that it doesn't break interop. Perhaps we should add a temporary subsection to the spec on how to this, with a note that it'll be removed before publication. It could say something like this:
1. If using draft-28 or later, these transport parameters MUST be sent, and received ones MUST be validated.
2. If using draft-27 or earlier, these transport parameters SHOULD be sent, and upon receipt:
    - if `handshake_connection_id` is present, then validate using draft-28 rules
    - else validate using draft-27 rules

Thoughts?

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