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

[Martin Thomson <[e-mail]>]

martinthomson 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 milliseconds. The alias is only valid
+  for that lifetime, clients MUST NOT use it after expiry.
+

If the idea that this lifetime is also a commitment to support a given version, then this isn't really a fully effective downgrade-prevention mechanism.  I expect that we'll see something good on that shortly.

I would instead prefer to say that the server is required to honour the alias for the entire advertised lifetime *unless* it also stops supporting that QUIC version.

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