An abstract class that when implemented provides an identity that enables the authentication of an endpoint by clients that exchange messages with it.
一个抽象类，实现此类后可提供一个标识，与终结点交换消息的客户端可以使用该标识对终结点进行身份验证。
An abstract class that when implemented provides an identity that enables the authentication of an endpoint by clients that exchange messages with it.
一个抽象类，实现此类后可提供一个标识，与终结点交换消息的客户端可以使用该标识对终结点进行身份验证。
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