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MSC4213: Remove `server_name` parameter

MSC4156 deprecated the server_name parameter on /_matrix/client/v3/join/{roomIdOrAlias} and /_matrix/client/v3/knock/{roomIdOrAlias} in favor of a new parameter via. This change shipped in Matrix v1.12. In line with the deprecation policy, the server_name parameter is now eligible for removal from the spec.

Proposal

The deprecated server_name parameter is removed from /_matrix/client/v3/join/{roomIdOrAlias} and /_matrix/client/v3/knock/{roomIdOrAlias}.

Potential issues

None. Servers can continue advertising support for earlier versions of the spec that included server_name via /_matrix/client/versions.

As of writing, the following stable implementations of MSC4156 are known to the author:

synapse: https://github.com/element-hq/synapse/pull/17650
dendrite: https://github.com/matrix-org/dendrite/pull/3438
matrix-js-sdk: https://github.com/matrix-org/matrix-js-sdk/pull/4381
ruma: https://github.com/ruma/ruma/pull/1891
trixnity: https://gitlab.com/trixnity/trixnity/-/merge_requests/478

Alternatives

None.

Security considerations

None.

Unstable prefix

None.

Dependencies

None.