diff --git a/server.go b/server.go
index 00f0d5e..eb54f47 100644
--- a/server.go
+++ b/server.go
@@ -463,6 +463,7 @@ func (server *Server) fastesUpstream(r *http.Request, lastModified time.Time) (r
 					resultResponse, resultCh, resultErr = response, ch, err
 					notModifiedCh <- idx
 				})
+				logger.Debug("voted not modified")
 				return
 			}
 
@@ -478,7 +479,7 @@ func (server *Server) fastesUpstream(r *http.Request, lastModified time.Time) (r
 				}
 			})
 
-			logger.Debug("voted")
+			logger.Debug("voted update")
 		}()
 	}
 
@@ -486,14 +487,18 @@ func (server *Server) fastesUpstream(r *http.Request, lastModified time.Time) (r
 
 	resultIdx = -1
 
-	if idx, ok := <-updateCh; ok {
+	select {
+	case idx := <-updateCh:
 		resultIdx = idx
 		slog.With("upstreamIdx", resultIdx).Debug("upstream selected")
-	} else if idx, ok := <-notModifiedCh; ok {
-		resultIdx = idx
-		slog.With("upstreamIdx", resultIdx).Debug("upstream selected(not modified)")
-	} else {
-		slog.Debug("no valid upstream found")
+	default:
+		select {
+		case idx := <-notModifiedCh:
+			resultIdx = idx
+			slog.With("upstreamIdx", resultIdx).Debug("all upstream not modified")
+		default:
+			slog.Debug("no valid upstream found")
+		}
 	}
 
 	return