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如果Client向服务器发送数据,这个报文头部的 ACK 是等于 1 的。原因见这个答案的「看到有人说,只看到过TCP状态位为 ’FIN +ACK’,但从来没有看过状态位只有 ‘FIN’,你应该怎样给他解释?」部分。
报文成功送到服务器,服务器会读取 ACK number,进入 establish 状态。
这个 issue 咱们讨论的服务端返回差错报文的情况,应该是更特殊的情况,不在这个主题的讨论范围内吧。