客户端存根通过使用RPC运行时例程从内核中读取网络消息。
The client stub reads the network messages from the kernel through the use of RPC runtime routines.
这个facade接口与首选源的接口相匹配，并且首选的接口中包含一个或多个操作，这些操作允许客户端查找(读取)匹配各种标准的信息。
The facade interface matches that of the preferred source, and the preferred interface contains one or more operations that allow the client to find (read) information matching various criteria.
客户端还读取Last - Modified响应Header，并在if - Modified - Since Header中发回日期值，以向服务器询问资源是否已更改。
The client also reads the Last-Modified response header and sends back the date value in an If-Modified-Since header to ask the server if the resource has changed.
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