REST response code for invalid data

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400 is the best choice in both cases. If you want to further clarify the error you can either change the Reason Phrase or include a body to explain the error.

412 – Precondition failed is used for conditional requests when using last-modified date and ETags.

403 – Forbidden is used when the server wishes to prevent access to a resource.

The only other choice that is possible is 422 – Unprocessable entity.

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