451
Unavailable For Legal Reasons
4xx Client error
Class
RFC 7725
Defined in
What does HTTP 451 mean?
Access is denied because of a legal demand. Named after Fahrenheit 451. Used when content is blocked by court order, government censorship or regional legal restrictions; the response should explain the demand and who made it.
4xx Client error: The request has a problem the client can fix: wrong URL, missing credentials, bad data or too many requests.
451 and SEO
The page is not indexed in regions where it returns 451.
Example response
HTTP/1.1 451 Unavailable For Legal ReasonsRelated status codes
- 403 Forbidden — The server understood the request but refuses to authorise it.
- 404 Not Found — The server cannot find anything at the requested URL.
- 410 Gone — The resource has been permanently removed and will not return.
Check which status code a URL returns with the HTTP header checker.
All HTTP status codesSearch the full list of status codes from 100 to 599 with their meanings and SEO impact.
Open the full list Frequently asked questions
What does status code 451 mean?
451 Unavailable For Legal Reasons: Access is denied because of a legal demand.
Does 451 affect SEO?
The page is not indexed in regions where it returns 451.