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.
连接关闭：在发送完所有数据之后，通信伙伴中的一方想要关闭连接。
Connection shutdown: Once all the data have been sent, one of the communication partners will want to shut down the connection.
尽管几率很小，可还是有可能??RPC服务在给我们发送完响应后宕掉，但还没来得进行消息确认。
Although unlikely, it is possible that the RPC server will die just after sending us the answer, but before sending an acknowledgment message for the request.
应用推荐