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Answer: The similarity of these three modes is that they all serve as an intermediate layer between the client and the real used class or system, which plays the role of allowing the client to indirectly call the real class. The difference is that the application occasions and intentions are different.The content of the website is stored on the source server, and the CDN is the cache of the content. Users are only allowed to access the CDN. If the content is not on the CDN, the CDN sends a request to the source server. In this way, as long as the CDN is large enough, it can resist great attacks. However, this method has a premise that most of the content of the website must be statically cached. For websites (such as forums) with dynamic content as the main content, we must think of other ways to minimize users' requests for dynamic data.Link: Ubuntu 16.04 Installing Eclipse DetailsA variety of schemes, the specific implementation can refer to the above introduction.Actor:因何不一致呢？因为有些娃儿楞了一会神，看见旁人跳了，他才跟着跳。故事根据民间传说钟馗伏妖故事改编。每逢千年便有日食天象,届时更是昆仑山灵力最弱,阴气最盛之时。此时,昆仑山魔井开启,魔能涌出,万妖出动。妖魔或附身于常人,夜间吸食人类阳气,被侵蚀的人们诡异而凶残；或化为人形捕食人类。恐怖灵异事件不断,你我之间难分人妖,人间如地狱般阴郁恐怖。终南山进士钟馗不惧邪祟,与师傅一起斩妖除魔,却发现在妖身后,还有更惊人,更令人恐惧,更令他难以抉择的真相在等待着他……