sdk client use identity key not ok, dont use username and password

[tonglin96]

Describe the bug dont use username and password to get config, set header for identity key and value, but rerturn 500 errocode

Expected behavior get config ok

Actually behavior rerturn 500 errocode

How to Reproduce Steps to reproduce the behavior: for example: nacos.core.auth.server.identity.key=serverIdentity, nacos.core.auth.server.identity.value=security

1. set metadata for "serverIdentity"="security"
2. get config

Desktop (please complete the following information):

• OS: mac
• Version: nacos-server 2.1.0, nacos-client 2.0.3
• Module: config
• SDK : golang

[KomachiSion]

I think you don't understand identity.key. Please see document again and has more understand for it.

[KomachiSion]

It used by server to make server communicate without auth, not for client to server.