Re: [quicwg/base-drafts] 0-RTT can't use transport parameters or 1-RTT frames (#2461)

Kazuho Oku <> Sat, 13 April 2019 16:30 UTC

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From: Kazuho Oku <>
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Subject: Re: [quicwg/base-drafts] 0-RTT can't use transport parameters or 1-RTT frames (#2461)
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kazuho approved this pull request.

LGTM modulo below.

> @@ -1422,6 +1422,15 @@ server's new preferred_address value in the handshake.
 A server MUST either reject 0-RTT data or abort a handshake if the implied
 values for transport parameters cannot be supported.
+When sending frames in 0-RTT packets, a client MUST only use remembered
+transport parameters; importantly, it MUST NOT use updated values that it learns
+from the server's updated transport parameters or from frames received in 1-RTT
+packets.  Updated values of transport parameters from the handshake apply only
+to 1-RTT packets.  For instance, flow control limits from remembered transport
+parameters apply to all 0-RTT packets even if those values are increased by the
+handshake or by frames send in 1-RTT packets.  A server MAY treat use of updated


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