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Add notes about the via key and authorised servers being out of sync.

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Patrick Cloke 2021-07-01 12:54:00 -04:00 • committed by Richard van der Hoff
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proposals/3083-restricted-rooms.md
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@ -206,6 +206,24 @@ restricting access via:
These are just examples are not fully thought through for this MSC, but it should
be possible to add these behaviors in the future.
### Interaction with `m.space.child` events
[MSC1772](https://github.com/matrix-org/matrix-doc/pull/1772) defines a `via`
key in the content of `m.space.child` events:
> the content must contain a via `key` which gives a list of candidate servers
> that can be used to join the room.
It is possible for the candidate servers and the list of authorised servers to
not be in sync. In the case where there's no overlap between these lists, it may
not be possible for a server to complete the request.
If there is some overlap between the lists of servers the join request should
complete successfully.
A future MSC may define a way to override or update the `via` key in a coherent
manner.
## Footnotes
<a id="f1"/>[1]: The converse restriction, "anybody can join, provided they are not members