Disable cors for isonline

connect/connection_test.go

@@ -194,6 +194,15 @@ func TestWebConnection_TLS(t *testing.T) {
 				t.Fatal(err)
 			}
 
+			_, ok := h.IsOnline()
+			if !ok {
+				t.Fatalf("host %s is not online", h.String())
+			}
+			_, ok = grpcHost.IsOnline()
+			if !ok {
+				t.Fatalf("host %s is not online", grpcHost.String())
+			}
+
 			ctx, cancel := grpcHost.GetMessagingContext()
 			resp := &pb.Ack{}
 			err = grpcHost.connection.GetGrpcConn().Invoke(ctx, "/messages.Generic/AuthenticateToken", &pb.AuthenticatedMessage{}, resp)

connect/webConn.go

@@ -219,7 +219,7 @@ func (wc *webConn) IsOnline() (time.Duration, bool) {
 	}
 
 	// IMPORTANT - enables better HTTP(S) discovery, because many browsers block CORS by default.
-	//req.Header.Add("js.fetch:mode", "no-cors")
+	req.Header.Add("js.fetch:mode", "no-cors")
 	jww.TRACE.Printf("(GO request): %+v", req)
 
 	req = req.WithContext(httptrace.WithClientTrace(req.Context(), trace))