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

["Philipp S. Tiesel" <[e-mail]>]

philsbln commented on this pull request.



> @@ -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;

Making the Lifetime a fixed uint32 in milliseconds would limit the alias to roughly two month. Could be a practical solution as the variant encoding does not really save space for lifetimes in the range of days.

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