Re: [quicwg/base-drafts] Rework Key Update (#2237)

[Kazuho Oku <[e-mail]>]

kazuho commented on this pull request.



> @@ -5012,6 +5020,44 @@ Reason Phrase:
   This SHOULD be a UTF-8 encoded string {{!RFC3629}}.
 
 
+## KEYS_READY Frame {#frame-keys-ready}
+
+An endpoint sends a KEYS_READY frame (type=0x1e) to signal that it has installed
+keys for reading and writing packets.  Receipt of this frame in a packet
+indicates that all earlier keys can be safely discarded.

IMO the most architecturally sane way would be to transmit all necessary ACKs for every epoch, and I am not sure how much I buy the argument that dropping Initial keys earlier is a win, considering that there would be 1-RTT injection window anyways. A middlebox that observes an Initial can send CONNECTION_CLOSE to both endpoints (as they do for TCP), regardless of when we drop the Initial key. However I also agree that losing the ability to see the ACK is not a big deal. So maybe it's nothing more than a matter of taste.

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