AAA information file can be used not only for identity mapping but also for authentication and authorization.
AAA 信息文件不仅可用于身份映射，还可以用于身份验证和授权。
Once the authentication process successfully establishes identity, authorization takes over to restrict or grant access.
一旦身份验证过程成功地建立起身份，授权就会接管以便进行访问的限制或允许。
Normally, when requests go to URIs without any authorization constraint, no identity is set up.
通常，在没有任何授权约束的情况下将请求加入URI时，不会设置任何标识。
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