Re: [quicwg/base-drafts] introduce a version alias mechanism (#2573)

MikkelFJ <> Mon, 01 April 2019 06:57 UTC

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Subject: Re: [quicwg/base-drafts] introduce a version alias mechanism (#2573)
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mikkelfj commented on this pull request.

> @@ -3246,7 +3246,21 @@ Implementors are encouraged to register version numbers of QUIC that they are
 using for private experimentation on the GitHub wiki at
+## Version Aliases
+In order to avoid ossification of the version number defined by this draft,
+servers announce a list of version numbers that they interpret as an alias for
+the version number used in this draft. Alias versions MUST NOT be a reserved
+version. Servers SHOULD send at least one version alias, and SHOULD frequently
+change the value that they announce. Each version alias contains a lifetime,

If we have this, is there any point to the concept of reserved versions at all? Perhaps this depends on future version negotiation.

> @@ -4115,6 +4130,25 @@ preferred_address (0x000d):
 {: #fig-preferred-address title="Preferred Address format"}
+version_aliases (0x000e):
+: A list of version numbers that the server accepts as an alias for the
+  currently used versions. This transport parameter is only sent by the server.
+  Every version alias contains a lifetime in seconds. The alias is only valid
+  for that lifetime, clients MUST NOT use it after expiry.
+   struct {
+     uint32 VersionNumber;
+     varint Lifetime;

Also, while seconds are fine, do we have seconds as a unit anywhere else - otherwise milliseconds may be a better unit.

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