"451" Error Will Tell Users When Governments Are Blocking Websites
Daniel_Stuckey writes "To fend off the chilling effects of heavy-handed internet restriction, the UK consumer rights organization Open Rights Group wants to create a new version of the '404 Page Not Found' error message, called '451 unavailable,' to specify that a webpage wasn't simply not there, it was ordered to be blocked for legal reasons."
For those who missed the reference and didn't click the links, this is a reference to Fahrenheit 451.
Technoli
Showed up in Wikipedia around June 2012, references a draft specification from June 11 2012. So yeah its been around for over a year.
40X errors can still return an entity. The HTTP spec even says that the server SHOULD return an entity explaining the error. I'm afraid you're the one being a moron.