Re: [quicwg/base-drafts] Invariant independent (#3684)

David Schinazi <> Tue, 26 May 2020 22:59 UTC

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Date: Tue, 26 May 2020 15:59:35 -0700
From: David Schinazi <>
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Subject: Re: [quicwg/base-drafts] Invariant independent (#3684)
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@DavidSchinazi commented on this pull request.

>  # QUIC Packet Headers
-A QUIC packet is the content of the UDP datagrams exchanged by QUIC endpoints.
-This document describes the contents of those datagrams.
+QUIC endpoints exchange UDP datagrams that contain one or more QUIC packets.
+This section describes the invariant characteristics of a QUIC packet.  A
+version of QUIC could permit multiple QUIC packets in a single UDP datagram, but
+the invariant properties only describe the first packet in a datagram.

I agree with @martinthomson here. Since the long header length is version-specific, it's not possible to access any subsequent packets in the same UDP payload from just the invariants. Stating in the invariants that some QUIC versions might allow packet coalescing is not a design change, it's just a fact.

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