- When users configure plain IP addresses (e.g. 8.8.8.8, 1.1.1.1, 77.88.8.8) with DoH (https in sing-box), sing-box requires a non-empty HTTP path (defaulting to /dns-query) and proper TLS SNI (server_name) matching the provider certificate.
- Added default /dns-query path fallback in server_from_options().
- Added KNOWN_DNS_SERVER_NAMES mapping for Google, Cloudflare, Yandex, Quad9, AdGuard, Mullvad, Control D, AliDNS, OpenDNS, DNS.SB to provide correct TLS SNI when connecting to raw DNS IPs.
- Added comprehensive DoH/DoT unit tests in tests/dns_failover.sh.
Dushnilin