Following today’s call, here again  is the Chrome browser extension Bouncer

https://chrome.google.com/webstore/detail/baycloud-bouncer/bplgfejjkplajgmkcbbgaeceamceohkc?hl=en-GB&gl=GB

It shows how sites and third-parties respond the DNT, if they have a TSR, EFF Policy, TSV response header etc. Click on the TSR one to see the actual TSR

It implements the full API, use this test page to exercise it:

https://baycloud.com/api/test

and here again is the DNTGuide document:

https://trackingprotection.github.io/Implementation/DNTGuide/

Mike