diff --git a/pkg/extension/server.go b/pkg/extension/server.go
index 9e38a22f2aec12bf930160ad004952195c3581d4..af1f8371c846550899bdf5e99e4d85021cc2073a 100644
--- a/pkg/extension/server.go
+++ b/pkg/extension/server.go
@@ -87,7 +87,9 @@ func (srv *Server) Action(ctx context.Context, in *pb.ActionRequest) (*pb.Action
 		if err != nil {
 			return nil, err
 		}
-		ext = actionURL.Extension()
+		if actionURL.Scheme == "grpc" {
+			ext = actionURL.Extension()
+		}
 	}
 
 	svc, ok := srv.services[ext]