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

Martin Thomson <> Tue, 26 May 2020 00:30 UTC

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Date: Mon, 25 May 2020 17:30:50 -0700
From: Martin Thomson <>
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Subject: Re: [quicwg/base-drafts] Invariant independent (#3684)
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@martinthomson 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 think that this is far more pragmatic than that.  It says that this document can only talk about the first packet in a datagram because it doesn't have any way of identifying other packets.  That's pure mathematics from my perspective, not a design change.  

I don't see this as anything more than editorial on that basis, but I will pass this to the list.

(BTW, you don't strictly need a length, because you could start from the other end of the datagram payload to find a second packet.)

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