Note interaction with Alt-Svc.

as per Patrick
httpwg · Feb 13, 2017 · e2083ad · e2083ad · martinthomson · Feb 13, 2017
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commit e2083ad
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diff --git a/draft-ietf-httpbis-origin-frame.md b/draft-ietf-httpbis-origin-frame.md
@@ -242,3 +242,7 @@ used for with subsequent ORIGIN frames later (e.g., when the connection is idle)
 
 Senders should note that, as per {{!RFC6454}} Section 4, the values in an ORIGIN header need to be
 case-normalised before serialisation.
+
+Finally, servers that allow alternative services {{?RFC7838}} will need to explicitly advertise
+those origins when sending ORIGIN, because the default contents of the Origin Set (as per {{set}})
+do not contain any Alternative Services, even if they have been used previously on the connection.