Conditions two (or more) subdomains (same domain) …share a common wildcard ssl certificate on the same host (same IPv4-address) but with different IPv6-addresses client: Firefox (only Firefox has this behavior) use HTTP/2 use IPv6 Expected behavior: foo.example.com in location bar shows foo.example.com bar.example.com in location bar shows bar.example.com Seen behavior Requests for the second host… Read More