Google's developer advocate Tim Bray has proposed a new HTTP Error status code to the IETF as an RFC to bring more transparency to the legal and government blocks and filters of content on the internet. Most blocking systems return a 403 error (Forbidden) when denying a user access; this is regarded as incorrect as the page does exist, it is just not accessible. For example, in the UK, where ISPs are required to block the Pirate Bay, most tend to return a 403 error code. Bray's proposal is that the 451 code should instead be returned with an explanation of why the content was unavailable. He offers the following as an example of such a returned message.
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