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451 Unavailable For Legal Reasons

The HyperText Transfer Protocol (HTTP) 451 Unavailable For Legal Reasons client error response code indicates that the user requested a resource that is not available due to legal reasons, such as a web page for which a legal action has been issued.

Status

451 Unavailable For Legal Reasons

Example

This example response is taken from the IETF RFC (see below) and contains a reference to Monty Python's Life of Brian.

Note: the Link header might also contain a rel="blocked-by" relation identifying the entity and implementing blockage, not any other entity mandating it.

Any attempt to identify the entity ultimately responsible for the resource being unavailable belongs in the response body, not in the rel="blocked-by" link. This includes the name of the person or organization that made a legal demand resulting in the content's removal.

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>

Specifications

Specification Title
RFC 7725: 451 Unavailable For Legal Reasons An HTTP Status Code to Report Legal Obstacles

Browser compatibilityUpdate compatibility data on GitHub

The information shown below has been pulled from MDN's GitHub (https://github.com/mdn/browser-compat-data).

Desktop
Chrome Edge Firefox Internet Explorer Opera Safari
451 Yes 12 Yes Yes Yes Yes
Mobile
Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
451 Yes Yes Yes Yes Yes Yes

See also

© 2005–2020 Mozilla and individual contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/451