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This is DDOS attack, which initiates a large number of requests in a short period of time, exhausts the resources of the server, cannot respond to normal visits, and causes the website to go offline substantially.For example, Tmall 618 opened the coupon collection and preheating online. When Osaka Weaving House transplanted it to offline stores, it cut the activity into six promotion bands with different themes, specifying the promotion time and purpose, and avoiding the rush of shopping guides. In each band, for different types of users, sales skills are set separately to improve the success rate of shopping guide.Hold down the mouse wheel220. X.X.102Original link: https://elie.net/blog/ai/events-against-machine-learning-an-overview反正小葱妹妹还要做，你们住一处，再做了给你也是一样的Does not exist in the white list-> Check whether it is the first SYN message of the IP within a certain period of time: if not, proceed to Step 3, if yes, proceed to Step 5