Re: [quicwg/base-drafts] Output of the discard keys design team (#2673)

David Schinazi <> Wed, 08 May 2019 21:06 UTC

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From: David Schinazi <>
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Subject: Re: [quicwg/base-drafts] Output of the discard keys design team (#2673)
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DavidSchinazi commented on this pull request.

>  1-RTT keys MAY be stored and later decrypted and used once the handshake is
+The requirement for the server to wait for the client Finished message creates
+a dependency on that message being delivered.  A client can avoid the
+potential for head-of-line blocking that this implies by sending its 1-RTT
+packets coalesced with a handshake packet containing a copy of the CRYPTO frame
+that carries the Finished message, until one of the handshake packets is
+acknowledged.  This enables immediate server processing for those packets.

Agree with @martinthomson, this is about leveraging coalesced packets to avoid head of line blocking, not about trying to elicit ACKs at 1-RTT

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