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TCP is connection-oriented, and a connection must be established between either side before sending data to the other. In TCP/IP protocol, TCP protocol provides reliable connection service, and the connection is initialized by three-way handshake. The purpose of the three-way handshake is to synchronize the serial numbers and acknowledgement numbers of both parties and exchange TCP window size information. The process of shaking hands can be represented by the following figure大周建国三百余年，看似太平盛世，然而在这风平浪静的表面下，实则已被妖族与魔族潜入，他们化形为人，搅得人间腥风血雨，且看穿越而来的痴傻公主叶橙，与蛇妖美男一起守卫人间，今天怼天尊，明天打仙界，她周旋在三界之中，维持三界平衡，修道之余，顺便谈一谈儿女情长的恋爱故事。章邯都大败而归，被迫投降了那么自己呢？刘邦在这一点上很有自知之明，故而不敢冒险。一个200万元的神奇帐户，将临海小城静海市搅了个天翻地覆，静海市人民检察院反贪污贿赂局副局长兼侦察一处处长奉命展开调查。　　3.网络告密This standard is proposed by the General Administration of Civil Aviation of China.Detecting CSRF vulnerabilities is a complicated task. The simplest method is to grab a normally requested data packet, remove the Referer field and resubmit it. If the submission is still valid, then the existence of CSRF vulnerabilities can basically be determined.