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Proxy: Proxy is also a group of hosts that attackers invade and control. They run attacker programs on them and accept and run commands from the master. The proxy host is the executor of the attack and really sends the attack to the victim host.Liskov Substitution Principle, LSP (Richter Substitution Principle) means that subclasses must replace their parent types. In other words, in the process of software development, after the subclass replaces the parent class, the behavior of the program is the same. Only when the subclass replaces the parent class and the function of the software is not affected can the parent class be truly reused, and the subclass can also add new behaviors to the parent class. In order to look at an example of violation of LSP principles, the specific code is as follows:午夜阳光又称永昼，是在地球的两极地区，一日之内，太阳都在地平线以上的现象，即昼长超过24小时。同名电视剧午夜阳光是由海润影视制作有限公司出品的偶像剧，该剧感人至极。路桥川（武雨泽 饰）、钟白（徐晓璐 饰）和任逸帆（于翔 饰）是高中时代的好友，彼此之间感情十分要好，三人共同考入了同一所大学，展开了属于他们的多姿多彩的大学生活。在学校里，钟白和路桥川结识了海洋（庞瀚辰 饰）、十三（应岱臻 饰）、一心（桑砚 饰）等好友，与此同时，钟白从高中一直延续到现在的对于路桥川的暗恋亦愈演愈烈。结果雁荡山这一下子又损失了五千，如今接管了东瓯一万多兵力，加起来堪堪超过七万。道光年间，河北玉田县有一位年青人杨昱乾自幼喜爱习武。而且他的机智仁勇，也为村中人所赞赏。乾出外寻找名师学艺落泊京城之际，有幸遇上一八卦掌的真英雄董汉成，欲上前拜师，却因董另有要事在身而赶速离去令乾失望不已。乾经过几番波折、转辗到河南甘县陈家堡，欲拜太极高手村长陈正英为师，却被英一口拒绝，并将乾赶出村。英遭人下毒，乾在令英不失尊严的情况下，救英一命，英深受感动，破例正式收乾为徒。乾终能如愿以偿，武功进步神速。在荣亲王王府里的武术大赛中，乾以其出神入化的太极拳，战胜八大高手，声名大噪。在英的指点下，乾那套改良的太极更为完善。乾在京城设馆授徒，不管清人、汉人或外国人，甚至残疾人士，均倾囊而授，绝无半点隐藏，令太极得以发扬光大，传向世界每一角落。乾更将孝、悌、忠、信、仁、义、礼、智，这些中国人传统的美德发挥得淋漓尽致，令乾成为“杨家太极”一代宗师。At that time, after the post was sent out, several pregnant women were fooled before the victims and replied that they wanted baby supplies. However, due to various reasons: some were not pregnant with male babies, some were not pregnant for enough months, and some were accompanied, so the murderer did not attack them. These pregnant women were lucky to escape.