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On the one hand, the core components of the network infrastructure have never changed in the past ten years, which makes some discovered and exploited vulnerabilities and some mature attack tools have a long life cycle and are still valid even today. On the other hand, the rapid development of the application of the Internet seven-layer model has diversified the attack targets of DDoS. From the web to DNS, from the three-layer network to the seven-layer application, from the protocol stack to the application App, the endless new products have also given hackers more opportunities and breakthrough points. Moreover, DDoS protection is a project with unequal technology and cost. Often, the construction cost of a business's DDoS defense system is larger than the cost or benefit of the business itself, which makes many start-up companies or small Internet companies unwilling to make more investment.沙加路对赵光头早已见怪不怪，转望杨长帆，大生意来了。这名高中生制造的一系列神秘死亡事件引起了一名侦探的注意，他开始追踪凶手，并试图解开事情的真相。张槐遂起身上前，对玉米道：不错。这是在家养成的习惯，近两年大哥教弟妹们早上起来练武，他跟着起哄玩儿，于是到时候就醒了。According to disease: gastric cancer, breast cancer, etc.In fact, the code only sets the newly opened WeChat in the new task stack, which is to intercept the return key in the page of WeChat LauncherUI in time "just hide the application in the background without exiting and then return to the desktop", thus our App is the launcher, so we return to our App. In the same way, WeChat can be seen by looking at the real running tasks in the navigation bar.