How DoNotTrack detection works?

melbao · January 17, 2018, 9:53pm

Hello,
I would like to know how the detection of the Do Not Track status works in the Matomo optout iframe.

peterbo · January 17, 2018, 10:52pm

It reads the DNT-Request-Header information which is sent by the browser and delivers the correct content accordingly.

melbao · January 18, 2018, 6:38pm

Have found it.
What is “$_SERVER[‘HTTP_X_DO_NOT_TRACK’]”?
"$_SERVER[’…’]" I know, but what is this “HTTP_X_DO_NOT_TRACK”?
A search on the internet did not yield a result with an answer.

Lukas · January 18, 2018, 9:16pm

I am not sure what you mean, but donottrack just makes the browser add a single http header („DNT:1“) to every request it sends.
You can detect it in php with ˋ(isset($_SERVER[‘HTTP_DNT’]) && $_SERVER[‘HTTP_DNT’] == 1);ˋ (HTTP_X_DO_NOT_TRACK is just an ancient variant that is kept for backwards compatibility reasons)

melbao · January 18, 2018, 9:47pm

ahhh, ancient. OK, thanks. solved.