412 Precondition Failed

http

HTTP/1.1 412 Precondition Failed

Explanation

A strong fit when using conditional requests such as `If-Match` with ETags.

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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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Request conflicts with current resource state.

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Well-formed request but semantic validation failed.

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