fix bug

http/middleware/logging/logging.go

@@ -31,6 +31,9 @@ func Server(logger log.Logger) middleware.Middleware {
 				code = se.Code
 				reason = se.Reason
 			}
+			if code == 0 {
+				return
+			}
 			level, stack := extractError(err)
 			log.WithContext(ctx, logger).Log(level,
 				"kind", "server",
@@ -67,6 +70,9 @@ func Client(logger log.Logger) middleware.Middleware {
 				code = se.Code
 				reason = se.Reason
 			}
+			if code == 0 {
+				return
+			}
 			level, stack := extractError(err)
 			log.WithContext(ctx, logger).Log(level,
 				"kind", "client",