Precondition Required

Client Error

The origin server requires the request to be conditional

Server requires If-Match or similar conditional header

How this status code appears in HTTP responses

HTTP Response Header

HTTP/1.1 428 Precondition Required

cURL Example

curl -I https://example.com
# Returns: HTTP/1.1 428 Precondition Required

This is a client error response indicating the request contains bad syntax or cannot be fulfilled.

Other codes in the same category

The server cannot process the request due to client error

Authentication is required and has failed or has not been provided

Reserved for future use in digital payment systems