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When an attacker sends an http post request, he sets the Content-Length to a large value in the request header and sends the http body to the web server at a very slow speed, byte by byte. The web server always needs to maintain the connection with the client and wait for the data transmission to end. Because the content-length is set to a large value and the http body transmission speed is very slow, attackers can occupy this connection for a long time.When the client SYN packet arrives at the filter gateway, the SYN agent does not forward the SYN packet, but actively replies the SYN/ACK packet to the client in the name of the server. If the client's ACK packet is received, it indicates that this is normal access. At this time, the firewall sends the ACK packet to the server and completes three handshakes. The SYN agent actually replaces the server to deal with SYN attacks. At this time, the filter gateway itself is required to have strong ability to prevent SYN attacks.小心撞头。切肉刀回来了！这次他带来了家人！天地混沌之初，神魔人三界混战之后，六界初定，魔王诞生，魔王赛尔坦，获得与神界对抗的力量。千百年来，他先后又在人间制造瘟疫、恐慌；挑拨妖界内部矛盾，毁妖界于内耗之中；追杀精灵界、地仙界。他最后一个目标是六界统领——神界。神界一旦失败，这天下，将会是魔的天下！[Truth] On April 27, a report in Chengdu Business Daily entitled "Investigation in Sichuan and Zhejiang: Security Guard Is Actually the Biological Father of" Orphans "said that during an interview in Xingwen County, the reporter found a secret hidden behind" Love Security Guard "for more than 10 years: Zheng Juming is actually Caixia's biological father! Zheng Juming told the reporter of Chengdu Business Daily the whole truth behind the lies and repented and apologized: "I'm sorry to all of you. The lies I made up hurt your feelings. I sincerely apologize to all of you."反正都这样了，你们为啥不试试哩？胖子瞪眼道：你说自己是富贵命就是富贵命啊？凭什么让我们相信你一个小孩子？把你杀了，我们跑得还快些。