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Since http is based on tcp, You need to complete a three-way handshake to establish a tcp connection before you can start http communication, Therefore, when http flood attacks are carried out, it is not possible to use forged source ip addresses to launch attacks. An attacker will typically use an http proxy server, Not only can the source be hidden from being traced, It also improves attack efficiency-after the attacker connects to the proxy server and sends the request, You can directly disconnect from the proxy server and start connecting to the next proxy server, At this time, the http connection between the proxy server and the target web server is still maintained, and the web server needs to continue to accept and process data. An efficient http flood attack should continuously send http requests for different resources and pages, and request resources that cannot be cached as much as possible (such as keyword search. User-related information, etc.)《我的白大褂·抗疫日记》是由深圳广电集团和深圳市卫生健康委员会联合出品，深圳卫视制作的全国首档医务人员亲身视角直击抗疫一线vlog。节目以医务人员的第一人称视角和独特的视频日记形式，直击抗疫一线的动人瞬间，讲述最美逆行者的故事。2月10日起每周一至周五19:35首播。101. X.X.84无数男男女女在看完《第一次亲密接触》后，将自己的网名改为了痞.子蔡和轻舞飞扬，期待着自己能有一场美好的网络恋爱。《芝加哥警署》（Chicago P.D.）里哪位警官需要医生？因为这里正好有一个医生的家属！ 　　据TVLine网站独家报道，《无耻家庭》（Shameless）男星尼克·戈尔弗斯（Nick Gehlfuss）将出演《芝加哥警署》，扮演杰·霍尔斯特德（Jay Halstead）的哥哥瑞恩·霍尔斯特德（Ryan Halstead），并将主演《芝加哥烈焰》（Chicago Fire）计划中的衍生剧《芝加哥医院》（暂译 Chicago Med）。 　　瑞恩这个循环角色“是个花花公子，更是位事业有成的医生。但总是逃避责任，”制片人马特·奥尔林斯特德（Matt Olmstead）表示。“情况一旦变得复杂，他就消失了。剧中的他则正处于不得不开始认真工作，在芝加哥寻找真实人生的时刻。”[News Survey] 20170819 Garbage! Rubbish!I don't care whether you are Baidu's written examination or Ali's or Tencent's pen examination questions. My side is collectively referred to as the WrittenTest. Then your company has different pen examination questions, which will be implemented by subclasses. No matter how the parent class method is implemented, I don't care what the pen examination questions are. The code changes to the following: