In HTTP networking, typically on the World Wide Web, referer spoofing (based on a canonised misspelling of "referrer") is the sending of incorrect referer information in an HTTP request in order to prevent a website from obtaining accurate data on the identity of the web page previously visited by the user.
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Referer spoofing is typically done for data privacy reasons, in testing, or in order to request information which some web servers may only supply in response to requests with specific HTTP referers.