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In order to construct a large number of data streams, hackers often need to construct request data through specific tools. These data packets do not have some behaviors and characteristics of normal users. In order to resist this kind of attack, we can analyze massive data, then model legitimate users, and use these fingerprint features, such as Http model features, data sources, request sources, etc., to effectively filter the white list of request sources, thus realizing accurate cleaning of DDoS traffic.Locate to the project directory of mytest and install the modules that the project depends on. These modules will be installed in the: mytest\ node_module directory, the node_module folder will be newly created, and the modules of the project will be downloaded according to the configuration of package.json.Source Port, Destination Port朱承（钱治钢饰）经营的“苔梨园大酒店”表面上虽然富丽堂皇，背地里却是乌烟瘴气。上自经理，下至服务生，都在营私舞弊。唯独营业部经理黄自勤（陈澍承饰）清廉自守，最受承信任。印尼富商何宏生（潘恩饰）假苔梨园举行“满汉全席”，采购部经理陈业（邬伟强饰）企图诈骗，为勤发现，业含恨在心。酒店副总经理汤玛斯走马上任，提出新方案，勤反对，汤心有不甘，收买赵景民（曾耀锋饰），企图洞悉酒店内幕。何独生女晓恬（陈莉萍饰）也到苔梨园开房，为占美（何其糖饰）等纨绔子弟所乘，幸为勤解围。何知悉女儿在酒店胡闹，暴跳如雷，父女俩引起口角，勤从旁开导恬，恬对勤心生仰慕……Conclusion: As the name implies, singleTop, if the current instance is at the top of the current task stack, it will be reused directly to test scenario 1. If the current instance is no longer at the top of the stack, create a new instance, such as Test Scenario 2, because it jumps from FirstActivity to SecondActivity every time. Although the SecondActivity instance already exists at the time of jumping to SecondActivity for the second time, another SecondActivity instance is created because it is not at the top of the stack.The meaning of cache agent is to cache the first run time, and when running the same again, it will be taken directly from the cache. The advantage of this is to avoid repeating the operation function once. If the operation is very complicated and consumes the performance, then using cache objects can improve the performance. We can first understand a simple cache column, which is the common addition and multiplication operations on the Internet. The code is as follows: