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If the connection initiator is legal, the firewall/proxy will receive the ACK, then establish a connection between itself and the server and disguise the address of the connection initiator. The firewall/proxy separates the two sides of the connection. This segmentation can resist SYN flooding attacks because the server has not accepted SYN from the attacker at all. As long as the firewall/agent implements some TCP-based defense policies, such as SYN? Cookies or SYN? Cache, he can protect all servers behind him from SYN flooding attacks.2. The coupling between the publisher and the subscriber is reduced. The publisher only publishes a message, and it does not care how the message is used by the subscriber. At the same time, the subscriber only monitors the event name of the publisher. As long as the event name of the publisher remains unchanged, it does not care how the publisher changes. Similarly, the seller (publisher) only needs to tell the subscriber (buyer) about the arrival of shoes, regardless of whether the buyer buys or not, or whether he buys other sellers. As long as the shoes arrive, the subscriber can be notified.2. The node objects in the chain can be flexibly split and reorganized, adding or deleting a node, or changing the location of the node is very simple.撰写《茶经》的陆羽为我们讲述了一个故事：宋朝时，在中国西南方，有公黑金茶族和母黑金族茶族烹制出各自性味不同的茶，日本人八木宗右卫门因无法忍受被公黑金族挑衅而让两族斗茶，最后以母黑金族被全面屠杀结束，只有一棵母黑金族茶的嫩芽被带去了日本而被保留下来。