Firefox HTTP/2 & IPv6: Webserver Subdomain Configuration Pitfall

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: in location bar shows in location bar shows Seen behavior Requests for the second host […]