Re: [quicwg/base-drafts] Describe interaction between QUIC and TLS regarding saved 0-RTT state (#2947)

Jana Iyengar <> Tue, 08 October 2019 22:35 UTC

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Subject: Re: [quicwg/base-drafts] Describe interaction between QUIC and TLS regarding saved 0-RTT state (#2947)
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janaiyengar commented on this pull request.

> @@ -644,6 +647,27 @@ A client MAY attempt to send 0-RTT again if it receives a Retry or Version
 Negotiation packet.  These packets do not signify rejection of 0-RTT.
+## Validating 0-RTT Configuration
+When a server receives a ClientHello with the "early_data" extension, it has to
+decide whether to accept or reject early data from the client. Some of this
+decision is made by the TLS stack (e.g., checking that the cipher suite being
+resumed was included in the ClientHello; see Section 4.2.10 of {{!TLS13}}). Even
+when the TLS stack has no reason to reject early data, the QUIC stack or the
+application protocol using QUIC might reject early data because the
+configuration of the transport or application associated with the resumed
+session is not compatible with the server's current configuration.
+QUIC requires additional transport state to be associated with a 0-RTT session
+ticket. If stateless session tickets are used, this information must be stored
+in the session ticket. Application protocols that use QUIC might have similar

@nharper : Can you address this comment?

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