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The first handshake: when establishing the connection, the client sends syn packet (syn=j) to the server and enters the SYN_SEND state, waiting for the server to confirm;该剧讲述了陆小凤不满贪官为患百姓民不聊生，遂考取功名，想要为民请命。谁知刚刚上任就与宋世杰结下怨仇，在公孙安份，展随风等人的帮助下与宋世杰斗智斗勇。宋世杰也为陆小凤的执着打动最终二人化敌为友，辅佐陆小凤惩戒贪官，扫除官场的不正之风。This method also uses token and validates it. Unlike the previous method, the token is not placed in the HTTP request as a parameter, but in a custom attribute in the HTTP header. Through the XMLHttpRequest class, you can add the HTTP header attribute csrftoken to all requests of this class at one time and put the token value into it. This solves the inconvenience of adding token to the request in the previous method. At the same time, the address requested through XMLHttpRequest will not be recorded in the address bar of the browser, and there is no need to worry that token will be leaked to other websites through the Referer.119. X.X.12Incident: Long River Redundancy, a village in Miyang Drama Village that founded the "Acting Troupe" with Li Runze, was charged with rape, but the specific details and the prosecution process are still unclear, and the case is still under investigation.Before adding this rule, we force the ping command on 146 to stop, and then use the following command to add a new rule at the front end of the INPUT chain of the filter table.2. Second handshake: The server receives SYN message segment. When the server receives the SYN message segment from the client, it needs to confirm the SYN message segment and set the Acknowledge Number to x+1 (Sequence Number+1); At the same time, I also need to send SYN request information, setting SYN position to 1 and Sequence Number to y; The server side puts all the above information into a message segment (i.e. SYN + ACK message segment) and sends it to the client side. At this time, the server enters the SYN_RECV state.