4xx Client errors
Last updated Sep 22, 2021

428 - Precondition Required

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The HTTP Status Code 428 means that the origin server requires the request to be conditional.

Status code 428 is intended to prevent the 'lost update' problem. This problem arises when a client makes a GET request on a given resource's state, changes said state, and PUTs it back. And at the same time another client has made a change on the same resource on the server.

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