Tk header

{{non-standard_header}}

[!NOTE] The DNT (Do Not Track) specification has been discontinued. See {{domxref("Navigator.doNotTrack")}} for more information. An alternative is Global Privacy Control, which is communicated to servers using the {{HTTPHeader("Sec-GPC")}} header, and accessible to clients from {{domxref("navigator.globalPrivacyControl")}}.

The HTTP Tk {{Glossary("response header")}} indicates the tracking status that applied to the corresponding request.

Syntax

Tk: !  (under construction)
Tk: ?  (dynamic)
Tk: G  (gateway or multiple parties)
Tk: N  (not tracking)
Tk: T  (tracking)
Tk: C  (tracking with consent)
Tk: P  (potential consent)
Tk: D  (disregarding DNT)
Tk: U  (updated)

Directives

• !
  • : Under construction. The origin server is currently testing its communication of tracking status.
• ?
  • : Dynamic. The origin server needs more information to determine tracking status.
• G
  • : Gateway or multiple parties. The server is acting as a gateway to an exchange involving multiple parties.
• N
  • : Not tracking.
• T
  • : Tracking.
• C
  • : Tracking with consent. The origin server believes it has received prior consent for tracking this user, user agent, or device.
• P
  • : Potential consent. The origin server does not know, in real-time, whether it has received prior consent for tracking this user, user agent, or device, but promises not to use or share any DNT:1 data until such consent has been determined, and further promises to delete or permanently de-identify within 48 hours any DNT:1 data received for which such consent has not been received.
• D
  • : Disregarding DNT. The origin server is unable or unwilling to respect a tracking preference received from the requesting user agent.
• U
  • : Updated. The request resulted in a potential change to the tracking status applicable to this user, user agent, or device.

Examples

A Tk header for a resource that claims not to be tracking would look like:

Tk: N

Specifications

{{specifications}}

Browser compatibility

This response header doesn't trigger any browser behavior, so browser compatibility is irrelevant.

See also

• {{HTTPHeader("DNT")}} header
• {{domxref("Navigator.doNotTrack")}}
• Do Not Track on Wikipedia
• What Does the "Track" in "Do Not Track" Mean? – EFF
• DNT on Electronic Frontier Foundation
• GPC - Global Privacy Control
  • Enabling GPC in Firefox