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Defense method: The defense against CC attacks needs to be combined with the characteristics of the specific business, A series of defense models are established for specific services, such as connection feature model, client behavior model, service access feature model, etc. Receiving client statistics of customer information and carrying out a series of processing according to model features, including blacklisting, limiting access rate, randomly discarding requests, etc.Ctrl + S: save file1940年代后期，出身望族的李彤（潘虹 饰）、黄惠芬（李克纯 饰）、雷芷苓（肖雄 饰）和张嘉行（卢玲 饰）四姐妹远渡重洋，来到美国留学。49年元旦，她们在学校联谊会上，用歌声抒发对祖国亲人的思念和祝福。不久，李彤因家中巨大变故离开三个女友，谁也不知她去了哪里。李彤的男友陈寅（濮存昕 饰）苦等无着，与惠芬和其他一对新人准备结婚。李彤突然出现在了婚宴上，她近乎疯狂的装扮和举止令朋友们惊诧，原来她已和一个已婚男人同居。时光荏苒，李彤后来又和一个南美商人混在一起，并因酒后滋事关进拘留所，保释出来后，她在惠芬女儿莉莉生日后不久，又不知飘向何方去了......//Set the first stateThe first type is implemented through the relationship between the parent class and the child class.