Front desk · HTTP Status Codes
4×× Client Error
451 Unavailable For Legal Reasons
· filed 2026-07-18 · click a code to copy
HTTP 451 Unavailable For Legal Reasons is a client error-class status code defined in RFC7725. The resource is unavailable for legal reasons (censorship, court orders, GDPR blocks).
Client-error responses signal that the problem is on the requesting side: the request is malformed, unauthorized, or aimed at something that isn't there. On the wire, the response begins with the status line HTTP/1.1 451 Unavailable For Legal Reasons.