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Yu Chen: Then everyone collapsed.Explanation of two sets of jreThe essence of the mirror server mentioned in the previous section is to build a miniature CDN by itself. The same is true behind the high-security IP provided by major cloud service providers: the website domain name points to the high-security IP, which provides a buffer layer to clean traffic and cache the content of the source server.Although the above code can meet the requirements, it is not easy to expand and difficult to read. If I want one or two conditions in the future, if I want to recharge 300 yuan successfully, I can win the 150 yuan red envelope, then I have to change the code inside at this time, so the coupling between business logic and code is relatively high, and I accidentally correct the wrong code. At this time, we try to use the responsibility chain mode to transfer objects in turn to realize it.秦国临淄。Private String name;The SYN flooding attack first appeared in 1996. At that time, Phrack magazine described this attack and implemented it in code [1]. This information was quickly applied to attack the mail and Telnet services of a network service provider (ISP) and caused downtime. CERT (Computer? Emergence? Response? Team) soon released a preliminary assessment and solution to this attack technology [2].