The Tk response header indicates the tracking status that applied to the corresponding request.

Header type Response header
Forbidden header name no

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

Specification Status Comment
Tracking Preference Expression (DNT)
The definition of 'Tk header field' in that specification.
Candidate Recommendation Initial definition.

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support ? ? ? ? ? ?
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support ? ? ? ? ? ? ?

See also

Document Tags and Contributors

Contributors to this page: fscholz
Last updated by: fscholz,