referer
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referer
(World-Wide Web)A misspelling of "referrer" which somehow
made it into the HTTP standard. A given web page's
referer (sic) is the URL of whatever web page contains the
link that the user followed to the current page. Most
browsers pass this information as part of a request.
This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)