Put [::1] into default listen addresses

doh-server/config.go

@@ -52,7 +52,7 @@ func loadConfig(path string) (*config, error) {
 	}
 
 	if len(conf.Listen) == 0 {
-		conf.Listen = []string{"127.0.0.1:8053"}
+		conf.Listen = []string{"127.0.0.1:8053", "[::1]:8053"}
 	}
 
 	if conf.Path == "" {

doh-server/doh-server.conf

@@ -1,6 +1,7 @@
 # HTTP listen port
 listen = [
-    "127.0.0.1:8053"
+    "127.0.0.1:8053",
+    "[::1]:8053",
 ]
 
 # TLS certification file