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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.Step 8: The program executes gadget 1. Instructions in the gadget cause the data in the stack to leave the stack in turn and save it in other general-purpose registers other than the esp register. The program then jumps to the address of the "int 0x80" system call.韩剧《太阳的后裔》精彩影像、制作花絮及策划特别节目Poor heart function and circulation will bring about changes in skin color, especially the lips and nail bed will become pale and blue;该剧讲述世界上最暖心的离别故事。描写妈妈鬼神（女主）为了变成人类在49天里的真实转世计划，和妈妈鬼神经历了生离死别的痛苦并展开新的人生的丈夫（男主），以及回到两人的孩子（童演）描绘的上天和被留在人间的人们的故事。“第一次”是“无论多少次”——。Although there are subclasses in java that implement the interfaces of the parent class, But I think javascript can be different from java, It is possible that the parent class in java is an empty class, Subclasses to implement the interface of the parent class, in javascript, I think the common code is completely written in the parent function. If the business logic needs to be changed in the future, or new business logic is added, we can completely use subclasses to rewrite the parent class, so the code has strong scalability and is easier to maintain. Since I am not a professional java, please understand if there is any mistake in describing the knowledge points in java ~ ~