documentation: Refactor DNS

docs/configuration/dns/server/https.md

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+---
+icon: material/new-box
+---
+
+!!! question "Since sing-box 1.12.0"
+
+# DNS over HTTPS (DoH)
+
+### Structure
+
+```json
+{
+  "dns": {
+    "servers": {
+      "type": "https",
+      "tag": "",
+      
+      "server": "",
+      "server_port": 443,
+      
+      "path": "",
+      "headers": {},
+      
+      "tls": {},
+      
+      // Dial Fields
+    }
+  }
+}
+```
+
+!!! info "Difference from legacy HTTPS server"
+
+    * The old server uses default outbound by default unless detour is specified; the new one uses dialer just like outbound, which is equivalent to using an empty direct outbound by default.
+    * The old server uses `address_resolver` and `address_strategy` to resolve the domain name in the server; the new one uses `domain_resolver` and `domain_strategy` in [Dial Fields](/configuration/shared/dial/) instead.
+
+### Fields
+
+#### server
+
+==Required==
+
+The address of the DNS server.
+
+If domain name is used, `domain_resolver` must also be set to resolve IP address.
+
+#### server_port
+
+The port of the DNS server.
+
+`853` will be used by default.
+
+#### path
+
+The path of the DNS server.
+
+`/dns-query` will be used by default.
+
+#### headers
+
+Additional headers to be sent to the DNS server.
+
+#### tls
+
+TLS configuration, see [TLS](/configuration/shared/tls/#outbound).
+
+### Dial Fields
+
+See [Dial Fields](/configuration/shared/dial/) for details.