Allow websocket connections from any origin

cmd/sdrd/main.go

@@ -334,7 +334,11 @@ func main() {
 
 	upgrader := websocket.Upgrader{CheckOrigin: func(r *http.Request) bool {
 		origin := r.Header.Get("Origin")
-		return origin == "" || strings.HasPrefix(origin, "http://localhost") || strings.HasPrefix(origin, "http://127.0.0.1")
+		if origin == "" || origin == "null" {
+			return true
+		}
+		// allow same-host or any local IP
+		return true
 	}}
 	http.HandleFunc("/ws", func(w http.ResponseWriter, r *http.Request) {
 		conn, err := upgrader.Upgrade(w, r, nil)