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Class has only one instance. Q: How can we guarantee it? Answer: Private constructors are used to ensure that classes cannot be instantiated outside the class.How should we defend against this attack? First of all, as users, we try our best to download APP from regular channels and surf the Internet in a civilized manner, and try our best not to make broilers. Secondly, as a service manufacturer, when the server is attacked by DDoS, we try our best to improve the processing capacity of the server. When the processing capacity of our server is greater than that of the attacker, these attacks are nothing to the server. Finally, under normal circumstances, the processing capacity of our server is generally lower than that of the attacker. In view of this situation, there are currently the following methods: 1. Violent methods, such as setting an access frequency threshold, and rejecting when the number of accesses per IP unit time exceeds this threshold; For a certain service, if the instantaneous request is too large, choose to directly refuse to ensure the normal operation of other services; This method may result in normal users not being able to use it. 2. Verification code. In order to prevent normal users from being injured by exposure methods, at present, service providers will send verification codes to "users" when receiving a large number of requests. If it is a real user, it will input verification codes, but if it is a broiler, it will not. Through this method, the real user and the broiler will be distinguished.朱县令接着道：皇上也大怒，怒斥道，国家正内外交困，此举既可弥补眼下国库空乏，又解决了未来的财税收入，还归拢了流民，让他们不再流离失所，有地可依。明到公司再商量吧。本剧围绕四名共同生活上百年的吸血鬼展开，第二季中他们将继续努力在当代美国找寻自我方向，啼笑皆非地面对人类超级碗派对、网络暴民、新晋加官恋权的精力吸血鬼，以及所有自在游荡于纽约都会区的幽灵、女巫、招魂师、僵尸和潜行刺客。电影讲述的是一个经历残酷青春的少年为爱复仇不惜付出生命的故事。