http - 为什么 HTTP_REFERER 是单一的或者不是 HTTP_REFERER？

Question

有时我的 facebook friend 会混淆 HTTP_REFERER 和 HTTP_REFERRER，因为在字典中只有 referrer。为什么拼写错误的标准协议(protocol)定义，为什么他们不尝试纠正错误？

Answer 1

http://en.wikipedia.org/wiki/HTTP_referrer

Origin of the term referer

The misspelling referer originated in the original proposal by computer scientist Phillip Hallam-Baker to incorporate the field into the HTTP specification.[1] The misspelling was set in stone by the time of its incorporation into the standards document Request for Comments (RFC) 1945; document co-author Roy Fielding has remarked that neither "referrer" nor the misspelling "referer" were recognized by the standard Unix spell checker of the period.[2] "Referer" has since become a widely used spelling in the industry when discussing HTTP referrers; usage of the misspelling is not universal, though, as the correct spelling of "referrer" is used in some web specifications such as the Document Object Model.