From a business perspective, this request is used to check the user authentication and authorization, which should not be cached.

从业务角度看，这个请求用于检查用户验证和授权，不应该被缓存。

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For example, IIS attempts to authenticate the user making the request and determine if the authenticated user has authorization to access the requested file.

例如，IIS将尝试对发出请求的用户进行身份验证，并确定通过身份验证的用户是否有权限访问被请求的文件。

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Authorize the requests based on the user credentials from the request header and called MDM service, where a policy expressed in XACML is used as a basis for the authorization decision making.

基于来自请求头的用户凭证和调用的MDM服务授权请求，其中以XACML表示的策略用作进行授权决策的根据。

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