/displayname returns non-JSON body

[KitsuneRal]

Description

An attempt to call /profile/{}/displayname with an empty body results (rightfully) in a 400 error, with plain text "Unable to parse name" in the response. The expected error payload is something about (could also be M_NOT_JSON instead of M_BAD_JSON):

{
    "errcode": "M_BAD_JSON",
    "error": "Unable to parse name" 
}

Version information

• Homeserver: matrix.org

[babolivier]

@KitsuneRal What's the request you performed? (i.e. what's the HTTP method you used?)

Both PUT and GET on https://matrix-client.matrix.org/_matrix/client/r0/profile/{}/displayname give me

{
    "errcode": "M_INVALID_PARAM",
    "error":"Expected UserID string to start with '@'"
}

[babolivier]

Oh looks like {} is a placeholder for the MXID here.
In which case I can reproduce.

[KitsuneRal]

Ok, I wasn't clear: {} in the endpoint path is just a shortcut for {userId}. The problem (which, embarrasingly, I can't reproduce either) is that with some empty JSON payload in the request body I end up with the plain-text body in the 400 response.