Re: [quicwg/base-drafts] disable_active_migration with SPA (#3765)

Igor Lubashev <> Tue, 16 June 2020 16:28 UTC

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Date: Tue, 16 Jun 2020 09:27:59 -0700
From: Igor Lubashev <>
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Subject: Re: [quicwg/base-drafts] disable_active_migration with SPA (#3765)
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@MikeBishop I would think the new behaviour is better delegated to an extension.

The new language (w/o an extension) irreparably causes performance problems for the kind of very common deployments I've indicated -- if they use disable_active_migration w/ SPA, migrating clients will be affected after switching to SPA; if they use disable_active_migration w/o SPA, clients cannot use a more performant/reliable preferred address.

However, if you have a server deployment where client migration w/ SPA is fine, just provide SPA and do not set disable_active_migration.  The purpose of SPA is to tell the client "you will get better service using that other address".  So clients will just switch to SPA as soon as they can, and everyone will be happy.

The new behaviour is pandering to not-very-well-behaved clients that do not obey SPA at the expense of well-behaved ones.

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