A Multiplayer API error, sent with HTTP 409. Status: the Multiplayer API is in private alpha; this code is part of its published contract.
When
The same Idempotency-Key came with a different body.
What to do
Use a new Idempotency-Key for a different request; reuse a key only to retry the exact same request.
The answer
Every error is a JSON body with a stable error code. Clients act on the codes they know and treat any other code as a failure of its HTTP status, and keep fields they do not know.
{
"error": "idempotency_key_reused",
"detail": "A sentence that is safe to show.",
"next": "Use a new Idempotency-Key for a different request; reuse a key only to retry the exact same request.",
"docsUrl": "https://lobbylab.gg/docs/errors/idempotency_key_reused"
}See also: every error code, the API reference and the docs.