Eran Messeri <[email protected]> wrote
Tue, 23 May 2017 10:41:49 +0100:

> (2) while the extensions field is currently unused, clients are required to
> ignore any extension they do not understand, so a log may put arbitrary
> data there.

You're right. So it's not impossible to track clients using the
extension field but at least it's visible.

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