Streaming channel is almost the same as long poll; the difference being that the server does not close the response stream.

流通道（streaming channel）与长轮询大致相同，差别在于服务器不会关闭响应流。

youdao

Renders an opening hyperlink tag to the response stream.

将一个超链接开始标记呈现到响应流。

youdao

Renders a postback event into the response stream as a link, including all required arguments.

将回传事件以连结的形式呈现到回应资料流中，其中包含所有必要的引数。

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In the case of the Mailbox app, the complexity is that we have multiple actions that we might want to take in response to a message in our incoming stream, some of which are immediate and others wich involve deferring immediate action for a later (specified or unspecified) time.

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