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Now, let's imagine why these "checkpoints" are called "chains" in iptables. As we know, The purpose of a firewall is to match "rules" for passing messages, Then execute the corresponding Action, So, when the message passes through these checkpoints, You must match the rules on this level, However, there may be more than one rule on this level, But there are many rules, When we put these rules in a chain, A "chain" has been formed. Therefore, we imagine each "checkpoint" as shown in the following figure. In this way, it is more appropriate to call them "chain". Each message passing through this "checkpoint" must match all the rules on this "chain". If there are qualified rules, the corresponding actions of the rules will be executed.《西京故事》是由西安曲江丫丫影视文化股份有限公司出品，姚远执导，张国强、陈小艺领衔主演的温情励志剧。该剧改编自陈彦的同名小说，讲述了一个普通农民家庭进城创业，实现人生理想的故事。东州市审计局经责处处长徐咏萍带领叶开、黄柯、袁忠诚、金逗逗组成的审计小组，在局长周维海和副局长董寿年的领导下，审计出东州钢铁公司总经理章劲松擅自挪用国有资金炒股的违法事实。在审计过程中，审计小组排除干扰，对东州市人民医院院长谭启聪的违规行为坚决查处；在医保项目的审计中发现了民营普济医院的骗保线索，为医保中心挽回一百多万元的损失。在审计署领导和市委书记的支持下，终于调查清楚北江区副区长万文杰与国土储备中心主任郭明恒勾结侵吞国家复垦资金和高速路建设补偿资金的贪腐大案。二零一零年，国家航天局挑选了一个香港科研团队作合作伙伴，于杰教授就是团队的掌舵人，他将会为登月任务研发「相机指向系统」。You can see the difference between the modified and the pre-modified, As shown in the following figure: Three, the problem in the experiment Question 1: At first, when I chose the experimental website, I chose the rebate website. It is also a website that does not need to enter a verification code to log in: but when I intercepted the page login information, I found that the website did not respond to the login key I pressed and did not make any jump, so I did not intercept any login information. Is this the defensive measure taken by the website to prevent replay attacks? What is the principle? Question 2: I don't think the interception and use of BurpSuite software is very successful. If it is really used as an attack method, I think it is too easy to be discovered by the attacker, or what is wrong with my use?《寻秦记》倒数第二章名为统一六国。该剧改编自明前雨后的小说《眼泪的上游》，讲述了夏小橘、陆湜祎、程朗、林柚等少年少女们共同度过的青春里，有关酸甜暗恋和治愈成长的故事。编剧金媛媛沙维琪担任导演