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+# MSC4235: `via` query param for /hierarchy endpoint
+
+To request the hierarchy of a space, clients need to call the
+[/hierarchy](https://spec.matrix.org/v1.9/client-server-api/#get_matrixclientv1roomsroomidhierarchy) endpoint introduced
+in [MSC2946](https://github.com/matrix-org/matrix-spec-proposals/pull/2946). This endpoint does not require user to join
+the room before responding with hierarchy details. It instead check whether the room is potentially joinable (per
+[MSC3173](https://github.com/matrix-org/matrix-spec-proposals/pull/3173)) before responding.
+
+Because it does not require a space room to be joined before calling this endpoint, it's possible that the requested
+room may not be locally available on the server. The server might need to request information over federation to
+respond. In such a case, this endpoint doesn't provide a mechanism for the client to specify the server name from which
+the server should request information.
+
+## Proposal
+
+The [/hierarchy](https://spec.matrix.org/v1.9/client-server-api/#get_matrixclientv1roomsroomidhierarchy) endpoint should
+include `via` as query parameter which server can use in case requested room in not locally available on the server.
+
+This change will stabilize the endpoint and allows clients to use this endpoint in more efficient manner, like: 
+1. Requesting the only part of sub-spaces hierarchy which is unknown the the client.
+2. Rendering the preview of space and it's children before joining the space.
+3. Since depth-first hierarchy responses can be costly, especially when reaching the end of the hierarchy, clients can
+   optimize the process by loading subspaces independently. This approach can improve efficiency by loading the
+   hierarchy of individual subspaces only when the user views them.
+
+## Potential issues
+Unknown
+
+## Alternative
+Unknown
+
+## Security considerations
+Unknown
+
+## Unstable prefix
+None