--- /root/mysql-8.0.28/router/src/router/src/config_generator.cc	2021-12-18 00:07:27.000000000 +0800
+++ config_generator.cc	2022-03-04 11:29:41.386181624 +0800
@@ -360,6 +360,9 @@ URI ConfigGenerator::parse_server_uri(co
           "non-'localhost' hostname: " +
           u.host);
     }
+  } else {
+    // setup localhost ip address.
+    u.host = (u.host == "localhost" ? "127.0.0.1" : u.host);
   }
 
   return u;