If no event occurs on the server side, a timeout occurs, and the server asks the client to reconnect asynchronously.

如果服务器端没有事件发生，而发生了超时，服务器端就会请求客户端进行异步重新连接。

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The server checks for any available updates and if there are no updates, the server delays completing the HTTP request until either there is information available or a timeout occurs.

服务器检查可用更新信息，如果没有更新信息，服务器将延迟完成HTTP请求，直到可用信息出现或者超时。

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If a set timeout or error occurs, an error message and refresh button are displayed to the user.

如果超过设置的时间或出现错误，将显示一条错误消息，并向用户显示刷新按钮。

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