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matrix-spec/proposals/1812-federation-make-member...

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MSC 1813 - Federation Make Membership Room Version

This proposal adds a new room_version field to the responses of /make_leave and /make_join APIs.

Motivation

It is planned for future room versions to be able to change the format of events in various ways. To support this, all servers must know the room version whenever they need to parse an event. Currently the /make_* APIs do not include the room version in the response, so the requesting server is unable to parse the event included in the response body.

Proposal

Add a new room_version field to the response body of the v1 /make_join and /make_leave APIs, which describes the room version.

For backwards compatibility servers must correctly handle responses that do not include the new field. In which case the room version is assumed to be one of either 1 or 2.