409 Conflict

http

HTTP/1.1 409 Conflict

Explanation

Common for uniqueness violations, version conflicts, and invalid state transitions.

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Same sheet · prioritizing Client and server errors

Malformed request syntax or invalid shape.

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Missing or invalid authentication credentials.

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Authenticated but not allowed to perform the action.

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The resource does not exist.

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Optimistic concurrency guard failed.

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Well-formed request but semantic validation failed.

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