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The code in the fourth step has some changes, putting the logical behavior corresponding to the state in the Upload class:明朝末年，新皇帝刚登基就面临皇位危机叛党威胁，他只得微服私访意欲铲除叛党。The firewall sets the SYN forwarding timeout parameter (the firewall for state detection can be set in the state table), which is much less than the timeout time of the server. When the client sends the SYN packet and the server sends the acknowledgement packet (SYN + ACK), if the firewall has not received the acknowledgement packet (ACK) from the client by the time the counter expires, it sends the RST packet to the server to cause the server to delete the half connection from the queue. It is worth noting that the setting of gateway timeout parameters should not be too small or too large. If the setting of timeout parameters is too small, it will affect normal communication. If the setting is too large, it will also affect the effect of preventing SYN attacks. This parameter must be set according to the network application environment.Specify the types of objects to be created with prototype instances, and create new objects by copying these prototypes. That is, implement the Cloneable interface and override the clone () method.更深一步的战略他也早已与徐文长商定。原来凯西和王家相识已久，她是王伟妈的得意门生，王伟心目中的萌妹子，更因缘凑巧搬到了拉拉家楼下。“嘀嘀嘀”超级警报拉响了，试看女汉子杜拉拉如何打败劲敌，杜拉拉的职场婚姻双重战斗欢笑登场！哈哈。