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Showing content from https://devdoc.net/web/developer.mozilla.org/en-US/docs/Web/Security/../HTTP/Headers/Tk.html below:

Tk - HTTP | MDN

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

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.

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.

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

Tk: N

• DNT header
• Navigator.doNotTrack

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