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 anyDNT: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. |
Obsolete | Initial definition. |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Tk | Chrome ? | Edge ? | Firefox ? | IE ? | Opera ? | Safari ? | WebView Android ? | Chrome Android ? | Firefox Android ? | Opera Android ? | Safari iOS ? | Samsung Internet Android ? |
Legend
- Compatibility unknown
- Compatibility unknown
See also
DNT
headerNavigator.doNotTrack