MSC4369: M_CAPABILITY_NOT_ENABLED error code for when capability is not enabled on an API endpoint #4369
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…d on an API endpoint
hughns
changed the title
turt2live
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proposal
zecakeh
reviewed
Nov 6, 2025
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| ## Proposal | ||
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| Define a new [other error code] of `M_CAPABILITY_NOT_ENABLED`. |
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Is there any value in having a specific error code for this? Clients should already know which endpoint is behind a capability, so M_FORBIDDEN should work just as well.
Actually I am wondering if instead of returning 403, it wouldn't be simpler to return 404 with M_UNRECOGNIZED, as if the endpoint is unimplemented?
This means that the endpoint doesn't actually have to be implemented by the homeserver if it doesn't support this capability (like POST /_matrix/client/v3/account/password which is useless if the homeserver only supports the OAuth 2.0 API for authentication), rather than forcing the homeserver to support this endpoint, only to return a specific error.
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I am employed by Element to write this MSC. Hence the use of the
io.elementnamespace in the unstable values.