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Adds proposed status code 451 Unavailable For Legal Reasons

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Samuel Ryan 2015-11-09 18:41:25 +00:00
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---
set: 4
code: 451
title: Unavailable For Legal Reasons
proposal: true
---
The server is denying access to the resource as a consequence of a legal demand.
The server in question might not be an origin server. This type of legal demand
typically most directly affects the operations of ISPs and search engines.
Responses using this status code SHOULD include an explanation, in the response
body, of the details of the legal demand: the party making it, the applicable
legislation or regulation, and what classes of person and resource it applies
to. For example:
```
HTTP/1.1 451 Unavailable For Legal Reasons
Link: <https://spqr.example.org/legislatione>; rel="blocked-by"
Content-Type: text/html
<html>
<head><title>Unavailable For Legal Reasons</title></head>
<body>
<h1>Unavailable For Legal Reasons</h1>
<p>This request may not be serviced in the Roman Province
of Judea due to the Lex Julia Majestatis, which disallows
access to resources hosted on servers deemed to be
operated by the People's Front of Judea.</p>
</body>
</html>
```
The use of the 451 status code implies neither the existence nor non-
existence of the resource named in the request. That is to say, it is possible
that if the legal demands were removed, a request for the resource still might
not succeed.
Note that in many cases clients can still access the denied resource by using
technical countermeasures such as a VPN or the Tor network.
A 451 response is cacheable by default; i.e., unless otherwise indicated by the
method definition or explicit cache controls; see [RFC7234][2].
---
* Source: [draft-ietf-httpbis-legally-restricted-status][1]
[1]: <https://tools.ietf.org/html/draft-ietf-httpbis-legally-restricted-status-03>
[2]: <https://tools.ietf.org/html/rfc7234>