For testing: http://referrerrerr.herokuapp.com/
- 35: doesn't respect the referrer meta tag at all (defaulting to
no-referrer-when-downgradebehavior) - 36: respects
no-referrer,origin,no-referrer-when-downgrade,unsafe-urland defaults toorigin - 37: respects ^^^ and 'origin-when-crossorigin'
- <= 39: ???
- 40: respects
no-referrer,origin,no-referrer-when-downgrade,unsafe-urland defaults tono-referrer