4xx Client error responses

428Precondition Required

Precondition required

#When does this occur?

Returned when the server requires conditional request headers. Headers like If-Match are needed to prevent data loss from concurrent modifications.

#How to handle?

Include conditional headers (If-Match, If-Unmodified-Since, etc.) in your request. Implement optimistic locking.

#Example

HTTP Response

HTTP/1.1 428 Precondition Required
Content-Type: application/json
Date: Tue, 10 Feb 2026 07:17:21 GMT

{
  "status": 428,
  "message": "Precondition Required"
}

#Related Status Codes

400Bad Request 401Unauthorized 402Payment Required 403Forbidden 404Not Found

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