There is an HTTP Header, called “Do Not Track”, but unfortunately, it has been broken.
The idea was that even under legislations that allow assuming users want to be tracked, this header being set by explicit user action would have been clear evidence that this assumption is wrong in this case.
Unfortunately, Google and Facebook refused to comply outright and with their tracking software running on pretty much all webpages, compliance was never an option for all those webpages.
And Microsoft killed it off completely, by setting it per default in Internet Explorer. Might sound like a good thing, but it meant that the header could be there, even if that particular user actually fucking loves being tracked, which meant it was pretty much legally void.