因此明智的做法是将警报消息的订阅与状态信息轮询相结合，提供一个健壮的与监控工具通讯的机制。
Therefore it is prudent to combine subscription to alert messages with polling of status information, to provide a robust mechanism for communicating with monitoring tools.
在长轮询请求中，客户机向服务器发出一个请求来检索可用信息。
In a long polling request, a client sends a request to a server to retrieve available information.
客户端可以通过请求-应答协议轮询服务器，以获得信息。
A client can poll a server, using a request - reply protocol to extract information.
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