Only once a single request contains all the required logon data the provider will actually try to authenticate the request.

只有在单一请求包含所有必需的登录数据的情况下，提供者才会真正开始尝试验证请求。

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The interceptor is asked if it can authenticate a certain request or not; in this case you check if valid user credentials are sent in request cookies.

询问拦截器是否可以验证某个请求；在此情况下，您可以检查在请求cookie中是否发送了有效的用户凭据。

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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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