HTTP status codes / 4xx — Client error
451 Unavailable For Legal Reasons
What it means
The server refuses to serve the content because a legal demand — court order, sanctions, DMCA, GDPR block — prohibits it. Numbered after Bradbury's Fahrenheit 451.
What causes it
Geo-blocking for legal compliance, takedown orders, region-restricted content.
How to fix it
Nothing technical to fix; the block is jurisdictional. The response should say which legal demand applies.