Bleeping Computer
Yesterday, GitHub announced rolling out a mysterious HTTP header on all GitHub Pages sites.
GitHub Pages enables users to create websites right from within their GitHub repository.
And it turns out, this header, now being returned by GitHub sites, is actually meant for website owners to opt-out of Google FLoC tracking.
BleepingComputer also noticed the entire github.com domain had this header set, indicating GitHub did not want its visitors to be included in Google FLoC’s “cohorts” when visiting any GitHub page.