服务器的客户端身份验证。

Client authentication of the server.

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用户认证层提供客户端身份验证以及多种验证方法。

A user authentication layer provides authentication for clients as well as several authentication methods.

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c option：客户端身份验证插件的全限定路径和插件名称。

C option: the fully qualified path and the plug-in name for the client-side auth plug-in.

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