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Football is called "the world's first sport". Football games were once popular in ancient Greece, Rome and China.微不足道，却又重要无比。沉睡雄狮是好听的说法，东亚病夫则是难听的那个。《诛仙》的诸多版权也被炒到一个非常离谱的价格。Let's define another initEvent function, which makes all ordinary objects have the function of publishing and subscribing, as follows:This strategy is mainly implemented by imposing rate limits on scarce resources such as IP and accounts. A typical example of this rate limit is to require the user to resolve the verification code to verify whether he publishes too frequently, as shown above.Reflective attacks typically use protocols that do not require authentication or handshake, The reflection attack needs to forge the source ip address of the requested data into the ip address of the target. If the protocol used requires authentication or handshake, the authentication or handshake process cannot be completed and the next attack cannot be carried out. Therefore, most reflection attacks are carried out by network services based on udp protocol.