Re: [quicwg/base-drafts] Specify whether 0-RTT MAY use the same CID as Initial packets (#1721)

[Martin Thomson <[e-mail]>]

I think that this is the only sensible outcome based on the description we have of the problem.

We should check that this is going to work though.  The current design intentionally has all 0-RTT with the same connection ID so that we could guarantee (ish) that it was consistently routed.  But that was based on the understanding that most 0-RTT in most cases would be sent prior to getting the server's first handshake flight.  Having the switch in connection ID happen, but be relatively rare (you would need partial loss of the server flight).  The assessment was that it would only cause problems.

With Stream 0, we have EndOfEarlyData, so a change in connection ID based on these rules would always happen, and so we'd expect to not see any odd bugs.  Unless I hear screams, I will make a PR following Christian's suggestion (though, note to self: we probably just want to remove the special handling text rather than add more of it, this might be a change that involves deleting text more than adding it).

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