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Sometimes my facebook friend confuses HTTP_REFERER and HTTP_REFERRER, because in the dictionary there is referrer only. Why does that misspelled standard protocol define, and why they don't try to correct the bug?
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There might be several reasons why the referer URL would be blank. It will/may be empty when the enduser: entered the site URL in browser address bar itself. visited the site by a browser-maintained bookmark.
In more simple terms, the referer is the URL from which came a request received by a server. A good example is if you click a link on the page site.com/page to go to another-site.com/link, the HTTP Referer received by another-site.com/link will have the value site.com/page.
$_SERVER['HTTP_REFERER'] Returns the complete URL of the current page (not reliable because not all user-agents support it) $_SERVER['HTTPS'] Is the script queried through a secure HTTP protocol.
The misspelling of referrer was introduced in the original proposal by computer scientist Phillip Hallam-Baker to incorporate the "Referer" header field into the HTTP specification.
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.
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See wikipedia
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.
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