等待流的关闭标签(以便最终建立DOM)就意味着等待整个会话结束。
To wait for the stream's closing tag (in order to finalize building the DOM) means waiting until the conversation ends.
注意,一旦发送完所有排队等待的消息后,它将关闭连接。
Notice that once it has sent all of the queued up messages, it closes the connection.
将呼叫等待关闭,这样通话就不会被打断
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