4xx Client error
451 Unavailable For Legal Reasons
The resource is blocked for legal reasons, such as a court order or government censorship.
The number is a nod to the novel Fahrenheit 451. The response may explain which authority demanded the block.
Common causes and fixes
- Usually region-specific — the content may be available elsewhere.
Example response
HTTP/1.1 451 Unavailable For Legal Reasons
Date: Thu, 22 Oct 2026 08:00:00 GMT Check a URL’s status with curl -I https://example.com, which prints the status line and headers.