前陣子送出的 HTTP Status Code 451 要通過成為標準了：「Why 451?」。
Today, the IESG approved publication of "An HTTP Status Code to Report Legal Obstacles". It'll be an RFC after some work by the RFC Editor and a few more process bits, but effectively you can start using it now.
取自「華氏451度」這部講出版物言論自由的作品 (紙的燃點是華氏 451 度)，在 Internet 時代，451 剛好在 HTTP Status Code 4xx 的範圍，被拿來用做「因法令限制而服法提供內容的 Status Code」。
在文件開頭說明了這個代碼的用途：
This document specifies a Hypertext Transfer Protocol (HTTP) status code for use when resource access is denied as a consequence of legal demands.