HTTP 451 Unavailable For Legal Reasons

In short: The content may not be delivered for legal reasons.

In more detail: The code was named in 2015 after the novel “Fahrenheit 451”. It indicates that a court order, law or official order forbids access, for example network blocks or country blocks.

In Depth

When it occurs

• Content that is forbidden in a country (geoblocking).
• After takedown requests because of copyright or personality rights.

What you can do

1. As a user this cannot be fixed; the block is legally intended.
2. Operators: explain in the body who demanded the block (header Link: rel="blocked-by").

See also: HTTP Status Codes Overview, HTTP