// REFERENCE
451 Unavailable For Legal Reasons
Class: 4xx
The resource is blocked for legal reasons (censorship, court order, GDPR). The number honors Fahrenheit 451. It signals censorship, not a technical failure.
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400
400 Bad Request 401
401 Unauthorized (not authenticated) 403
403 Forbidden (access denied) 404
404 Not Found 405
405 Method Not Allowed 406
406 Not Acceptable
400 Bad Request 401
401 Unauthorized (not authenticated) 403
403 Forbidden (access denied) 404
404 Not Found 405
405 Method Not Allowed 406
406 Not Acceptable
Semantics per RFC 9110 and the IANA status code registry. Educational content.