Tk response header indicates the tracking status that
applied to the corresponding request.
|Header type||Response header|
|Forbidden header name||no|
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)
- Under construction. The origin server is currently testing its communication of tracking status.
- Dynamic. The origin server needs more information to determine tracking status.
- Gateway or multiple parties. The server is acting as a gateway to an exchange involving multiple parties.
- Not tracking.
- Tracking with consent. The origin server believes it has received prior consent for tracking this user, user agent, or device.
- 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:1data until such consent has been determined, and further promises to delete or permanently de-identify within 48 hours any
DNT:1data received for which such consent has not been received.
- Disregarding DNT. The origin server is unable or unwilling to respect a tracking preference received from the requesting user agent.
- Updated. The request resulted in a potential change to the tracking status applicable to this user, user agent, or device.
Tk header for a resource that claims not to be tracking would look like:
|Tracking Preference Expression (DNT)
The definition of 'Tk header field' in that specification.
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