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The 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.特八点头，领人出舱。　　在这里，可以看到难以This standard is proposed by the General Administration of Civil Aviation of China.忽必烈自幼时就被成吉思汗认可，称必成大器。忽必烈自小善良，长大为蒙哥献计献策，可蒙哥却听信谗言，认为他怀有二心。于是，削夺其治理中原之权，命其征吐蕃和云南大理。忽必烈逐渐消灭云南大理国、议和南宋。于1260年在开平称汗，称大蒙古国可汗。