Do Not Track

Rare card · No. 31379

Do Not Track (DNT) is a deprecated non-standard HTTP header field designed to allow Internet users to opt out of tracking by websites, which includes the collection of data regarding a user's activity across multiple distinct contexts, and the retention, use, or sharing of data derived from that activity outside the context in which it occurred. The Do Not Track header was originally proposed in 2009 and was adopted by most major browsers within a few years. However, the header failed to find widespread respect among publishers, due to the lack of legislation requiring companies to support the DNT header and confusion about the header's meaning. The DNT header was abandoned by standards bodies such as the W3C. As of 2025, some browsers had removed the header, including Apple Safari and Mozilla Firefox. Following the failure of the DNT initiative, a coalition of US-based Internet companies announced the creation of the Global Privacy Control header which is intended to have explicit legal...

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