diff --git a/core/api.go b/core/api.go
index 6c3fc1f..f9e7d95 100644
--- a/core/api.go
+++ b/core/api.go
@@ -282,19 +282,23 @@ func (caller apiCaller) whitelistAPI(w http.ResponseWriter, r *http.Request) err
 func (caller apiCaller) serviceAPI(w http.ResponseWriter, r *http.Request) error {
 	mg := caller.mg
 	if r.Method == "GET" {
+		logger.Println("serviceAPI :", r.URL.Path)
 		if mg.service().Id.IsZero() {
+			logger.Println("  id is zero")
 			newService := serviceDescription{
 				ServiceDescriptionSummary: ServiceDescriptionSummary{
 					Id: primitive.NewObjectID(),
 				},
 			}
 			if err := newService.prepare(caller.mg); err != nil {
+				logger.Println("  prepare failed :", err)
 				return err
 			}
 			atomic.StorePointer(&mg.serviceptr, unsafe.Pointer(&newService))
 		}
 
 		serptr := atomic.LoadPointer(&mg.service().serviceSerialized)
+		logger.Println("  loadPointer :", string(*(*[]byte)(serptr)))
 		w.Write(*(*[]byte)(serptr))
 	} else if r.Method == "POST" {
 		body, _ := io.ReadAll(r.Body)