HTTP 451: Content unavailable for legal reasons

[Adam H]

I have to admit this is my "leant something new every day". Interesting new http status code :

At the end of last year, a new HTTP status code saw the light. This status code, HTTP 451, is intended to be shown specifically when content has been blocked for legal reasons. If you’ve received a take down request, or are ordered by a judge to delete content, this is the status code that allows you to indicate that. Since the 3.1 release, Yoast SEO Premium supports this new status code, allowing you to set a HTTP 451 status code for pages.

Read More... https://yoast.com/http-451-content-deleted/