Overview

Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The referrer, or HTTP referrer - also known by the common misspelling referer that occurs as an HTTP header field - identifies, from the point of view of an Internet webpage or resource, the address of the webpage (commonly the Uniform Resource Locator (URL); the more-generic Uniform Resource Identifier (URI); or the internationalization and localization (i18n)-updated Internationalized Resource Identifier (IRI)) of the resource which links to it. By checking the referrer, the new webpage can see where the request originated. Referrer logging is used to allow websites and web servers to identify where people are visiting them from, for promotional or security purposes. Referrer is a popular tool to combat cross-site request forgery, but such security mechanisms are weakened by the ease of disabling or forging a referrer. The referrer is widely used for statistical purposes. A dereferrer is a means to strip the details of the referring website from a link request so that the target website cannot identify the page which was clicked on to originate a request.

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