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The HTTP 428 Precondition Required response status code indicates that the server requires the request to be conditional.

Typically, this means that a required precondition header, such as If-Match, is missing.

When a precondition header is not matching the server side state, the response should be 412 Precondition Failed.

Status

428 Precondition Required

Specifications

Specification Title
RFC 6585, section 3: 428 Precondition Required Additional HTTP Status Codes

See also

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