It did not change. http is still served but if you are getting https it is due to hsts. Regardless; redirect != it changed
$ curl -I -H 'Upgrade-Insecure-Requests: 1' 'http://www.w3.org/Provider/Style/URI.html'
HTTP/1.1 307 Temporary Redirect
location: https://www.w3.org/Provider/Style/URI.html
vary: Upgrade-Insecure-Requests