package main import ( "net/http" "github.com/gorilla/mux" "github.com/rs/cors" ) func main() { r := mux.NewRouter() r.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) { w.Header().Set("Content-Type", "application/json") w.Write([]byte("{\"hello\": \"world\"}")) }) // Use default options handler := cors.Default().Handler(r) http.ListenAndServe(":8080", handler) }