Long polling is a polling technique in which the server will delay completing the HTTP response until either an update is ready for the client or a timeout occurs.

长轮询是一种轮询技术，其中服务器延迟完成HTTP请求，直至已经为客户机准备好了一个更新信息或发生超时。

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Bayeux implementations support a specific HTTP method called long polling.

Bayeux实现支持一种名为长轮询的特定HTTP方法。

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Both Bayeux and WebSockets attempt to avoid the resource limits by using a fall-back mechanism for long polling (in the case of Bayeux) or switching to a non-HTTP based secondary protocol instead.

Bayeux和WebSockets都试图避免资源限制问题，使用回退机制来实现长轮询(比如Bayeux)，或者切换到其他非http协议之上。

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