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The RFC is specific that a 451 response does not indicate whether the resource exists but requests for it have been blocked, if the resource has been removed for legal reasons and no longer exists, or even if the resource has never existed, but any discussion of its topic has been legally forbidden (see injunction). [7]
451 Unavailable For Legal Reasons (RFC 7725) A server operator has received a legal demand to deny access to a resource or to a set of resources that includes the requested resource. [25] The code 451 was chosen as a reference to the novel Fahrenheit 451 (see the Acknowledgements in the RFC).
451 Unavailable for Legal Reasons; Security access control methods; Basic access authentication; Digest access authentication; Security vulnerabilities; HTTP header injection; HTTP request smuggling; HTTP response splitting; HTTP parameter pollution
451 Unavailable for Legal Reasons; Security access control methods; Basic access authentication; Digest access authentication; Security vulnerabilities; HTTP header injection; HTTP request smuggling; HTTP response splitting; HTTP parameter pollution
451 Unavailable for Legal Reasons; Security access control methods; Basic access authentication; Digest access authentication; Security vulnerabilities; HTTP header injection; HTTP request smuggling; HTTP response splitting; HTTP parameter pollution
If an entity is temporarily unavailable, this instructs the client to try again later. Value could be a specified period of time (in seconds) or a HTTP-date. [56] Example 1: Retry-After: 120; Example 2: Retry-After: Fri, 07 Nov 2014 23:59:59 GMT; Permanent RFC 9110: Server: A name for the server: Server: Apache/2.4.1 (Unix) Permanent RFC 9110 ...
451 Unavailable for Legal Reasons; Security access control methods; Basic access authentication; Digest access authentication; Security vulnerabilities; HTTP header injection; HTTP request smuggling; HTTP response splitting; HTTP parameter pollution
451 Unavailable for Legal Reasons; Security access control methods; Basic access authentication; Digest access authentication; Security vulnerabilities; HTTP header injection; HTTP request smuggling; HTTP response splitting; HTTP parameter pollution