409Conflict
The request is valid but clashes with the current state of the resource, so it cannot be applied.
Browse all HTTP status codesWhen you see it
Editing a record someone else changed while you had it open, creating something with a name that is already taken, or two operations racing for the same resource.
A useful 409 explains what the conflict is, because the client usually needs to re-read the current state before it can decide what to do next.
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Status codes
69 of 69 codes. Click a row to copy it.
1xx Informational (4)
2xx Success (10)
3xx Redirection (8)
4xx Client errors (31)
5xx Server errors (16)