2015-11-09 19:41:25 +01:00
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---
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set: 4
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code: 451
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title: Unavailable For Legal Reasons
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proposal: true
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---
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The server is denying access to the resource as a consequence of a legal demand.
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The server in question might not be an origin server. This type of legal demand
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typically most directly affects the operations of ISPs and search engines.
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Responses using this status code SHOULD include an explanation, in the response
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body, of the details of the legal demand: the party making it, the applicable
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legislation or regulation, and what classes of person and resource it applies
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to. For example:
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```
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HTTP/1.1 451 Unavailable For Legal Reasons
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Link: <https://spqr.example.org/legislatione>; rel="blocked-by"
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Content-Type: text/html
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<html>
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2015-11-09 19:49:37 +01:00
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<head>
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<title>Unavailable For Legal Reasons</title>
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</head>
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<body>
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<h1>Unavailable For Legal Reasons</h1>
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<p>This request may not be serviced in the Roman Province
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of Judea due to the Lex Julia Majestatis, which disallows
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access to resources hosted on servers deemed to be
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operated by the People's Front of Judea.</p>
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</body>
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2015-11-09 19:41:25 +01:00
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</html>
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```
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The use of the 451 status code implies neither the existence nor non-
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existence of the resource named in the request. That is to say, it is possible
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that if the legal demands were removed, a request for the resource still might
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not succeed.
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Note that in many cases clients can still access the denied resource by using
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technical countermeasures such as a VPN or the Tor network.
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A 451 response is cacheable by default; i.e., unless otherwise indicated by the
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method definition or explicit cache controls; see [RFC7234][2].
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---
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* Source: [draft-ietf-httpbis-legally-restricted-status][1]
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[1]: <https://tools.ietf.org/html/draft-ietf-httpbis-legally-restricted-status-03>
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[2]: <https://tools.ietf.org/html/rfc7234>
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