extended URL scheme

node.go

@@ -11,6 +11,7 @@ import (
 var (
 	ErrNodesOffline     = errors.New("one or more nodes are offline")
 	ErrNodesNotSearched = errors.New("one or more nodes could not be searched")
+	ErrEmptyID          = errors.New("id is empty")
 )
 
 type NodeStatus string
@@ -95,11 +96,15 @@ func (c *NodeClient) FindServerByName(ctx context.Context, name string) (s *Serv
 }
 
 func (c *NodeClient) FindServerByID(ctx context.Context, id string) (s *Server, err error) {
+	if id == "" {
+		err = ErrEmptyID
+		return
+	}
 	return c.FindServer(ctx, "", id)
 }
 
 func (c *NodeClient) FindServerByURL(ctx context.Context, url string) (s *Server, err error) {
-	_, id, err := ParseURL(url)
+	_, _, id, err := ParseURL(url)
 	if err != nil {
 		return
 	}