Update in 2018: When I look at this article again, I don't know wtf I wrote too. But I'll face up to it no matter it's good or bad, so I still post it.
If you are an IT enthusiast (like me), you might have heard that IESG (Internet Engineering Steering Group) had passed a new HTTP error state code 451 on December 18th last year (2015).
Sounds strange, who's the newcomer 451? Now I will introduce it to you.
We know that when we are browsing internet, if the contents are loaded correctly, then we won't see some strange things in a mess (which gives an HTTP code 200). However, browsing internet is similar to our life, it is impossible to avoid all accidents. I believe that you must have seen some other codes like 403, 404, 500, right? Then I will talk about who they are.
403, that means telling the person who is not permitted to enter and view, edit, to get away.
404, that means "Sorry, we don't have this stuff, so please don't ask for it again."
500, that means "Sorry, our server encountered some problems, you can't connect to the thing you want to view, please come again later."
OK, after talking about the three old members above, now I go back and talk about 451. Actually, 451 had already put forward in 2013. At that time, there is a guy Tim Bray proposed it based on another guy Terence Eden's article. After about 2 years, IESG finally approved HTTP 451, this code shared some characteristics which originally belonged to HTTP 403/404, which represents that web pages deemed a danger to national security, or web pages deemed to violate copyright, privacy, blasphemy laws, or any other law or court order. Simply put, that means if there is a web page which makes government, author (copyright holder), individual, gods or judge into a bad mood, now we can make it 451! (yeah!)
Why does it choose 451? It is said that it comes from Ray Bradbury's 1953 dystopian novel Fahrenheit 451, in which books are outlawed.
With HTTP 451, it reduces chances for people to reach illegal things. But when we think reversely, it will also reduce negative examples for us for reference, right?
This article is mainly referring to Wikipedia, if you would like to know more about HTTP 451, you may visit here[1].
[1]: As the original link has dead, the link is replaced with the saved one from Wayback Machine.
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