TiDB fails to connect to TiProxy in local deployment

[djshow832]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

1. Start a TiDB cluster manually (without TiUP).
2. Query information_schema.cluster_config.

2. What did you expect to see? (Required)

The output shows TiProxy.

3. What did you see instead (Required)

The output doesn't show TiProxy. Instead, it reports a warning:

mysql> show warnings;
+---------+------+--------------------------------------------------------------------------------------------------------+
| Level   | Code | Message                                                                                                |
+---------+------+--------------------------------------------------------------------------------------------------------+
| Warning | 1105 | Get "http://192.168.0.127:3080/api/admin/config?format=json": dial tcp 192.168.0.127:3080: i/o timeout |
+---------+------+--------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)

4. What is your version? (Required)

master