Onion-Location is a non-standard HTTP header that websites can use to advertise their onion counterpart.
If the website that you are visiting has an onion site available, a purple suggestion pill will prompt at the URL bar in Tor Browser displaying ".onion available".
Lorsque vous cliquez sur ".onion disponible", le site web est rechargé et redirigé vers son équivalent en onion.
Translation notes: Do not translate.