HTTP 451
HTTP RESPONSE STATUS CODE
451 error; Unavailable For Legal Reasons; Error 451; Unavailable for Legal Reasons; 451 Unavailable For Legal Reasons; HTTP ERROR 451
In computer networking, HTTP 451 Unavailable For Legal Reasons is a proposed standard error status code of the HTTP protocol to be displayed when the user requests a resource which cannot be served for legal reasons, such as a web page censored by a government. The number 451 is a reference to Ray Bradbury's 1953 dystopian novel Fahrenheit 451, in which books are outlawed.