451Unavailable For Legal Reasons
The content is being withheld because of a legal demand, such as a court order or a takedown notice.
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Government-ordered blocks, copyright takedowns, and content withheld in particular countries. The number is a deliberate reference to Fahrenheit 451.
It exists so that legal removal is distinguishable from technical failure. A 404 would hide the fact that something was taken down, and the point of 451 is that this fact should be visible.
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Status codes
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1xx Informational (4)
2xx Success (10)
3xx Redirection (8)
4xx Client errors (31)
5xx Server errors (16)