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。
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。
Acegi USES servlet filters to authenticate users before request processing.
在请求执行之前，Acegi使用servlet过滤器对用户进行身份验证。
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