By default, it has a poll interval that is set to 60000 milliseconds.

在缺省情况下，它的轮询间隔设置为60000毫秒。

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The client in turn sends another request after a predetermined interval (poll interval) and this process continues until there is an update from the server.

客户机根据预定的时间间隔(轮询间隔)依次发送另一个请求，继续这个过程，直至服务器中有一个更新。

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