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Especially in some forums and other websites that support users to publish their own content, hackers can publish the addresses of their personal websites on them. Since the system will also add a token to this address, hackers can get the token on their own websites and launch CSRF attacks immediately. In order to avoid this, the system can add a judgment when adding token. If the link is linked to its own site, the token will be added later, and if it is connected to the external network, it will not be added. However, even if the csrftoken is not attached to the request in the form of a parameter, the hacker's website can also obtain the token value through the Referer to launch a CSRF attack. This is also why some users like to manually turn off the browser Referer function.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:其中多有隐情，需要细细说明，若是上将军因此问罪沛公，来日真相大白，上将军的威名和声誉必然大受影响，项兄也不忍看到这样的情形吧？上次子啊新安，项伯也曾全国项羽，奈何项羽没给自己这个亲叔叔一点面子。洪恩三只小猪学英语——和三只小猪一起学习简单的英语单词和对话~只有香荽隐隐知道缘故，瞅了弟弟一眼，以目示意他不可造次。度假归来的弗兰（塔姆辛·格雷格 Tamsin Greig 饰）发现布莱克书店更阴暗脏乱了，书籍和垃圾堆积成山，店内一个顾客也看不到。原来伯纳（迪兰·莫兰 Dylan Moran 饰）终于彻底惹怒了曼尼（比尔·贝利 Bill Bailey 饰），曼尼赌气出走到了隔壁新开的书店，留下生活无法自理的伯纳与垃圾为伴。/mad (crazy)