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In the process of SSL handshake, no matter whether the data transmitted by the client is valid or not, the server needs to spend more CPU resources to decrypt and verify the validity of the data. Attackers can use this feature to carry out flood attacks.Imagine a scene where there is an electric lamp with only one switch on it. When the light is on, press the switch at this time and the light will switch to the off state. Press the switch again and the light will be turned on again. The behavior of the same switch button is different in different states.于是乎越军在成皋城外按照汉军的约定点燃了烽火，让荥阳和广武山的齐军误会。泰版我的女孩。我还从来没有见过如此厚颜无耻之人。《北京女子图鉴》以小城姑娘陈可怀揣梦想执意北上为开篇，她不断地经历选择和被选择，在更迭和得失之间，最终继续坚定地前行在北京的故事。一个条件普通的外地女孩来到北京，没有傻白甜、玛丽苏、靠男人解决危机、和姐妹反目等，女主陈可没有主角光环，每走一步都是教训和经验，每阶段也都有欲望和杂念，她不是需要膜拜和羡慕的大女主，只是在北京生存的你和我，不依附于他人，而是选择独立成长。北京让女性有机会坦诚野心，追逐欲望，这是一座应该被感谢的城市。让北漂的女子们感同身受，知晓身在异乡仍有人同行，女性成长需要相互鼓励陪伴。? Generally speaking, the factory mode is suitable: whenever a large number of products need to be created and have a common interface, they can be created through the factory method mode. Of the above three modes, the first cannot create the object correctly if the incoming string is wrong, and the third does not need to instantiate the chemical factory class compared with the second, so in most cases, we will choose the third-static factory method mode. ?