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When an attacker sends an http get request, Slowly sending useless header fields, And never sends the "\ r\ n\ r\ n" end flag, This allows the connection to the web server to be occupied for a long time and ensures that the link is not broken by timeout. However, the number of concurrent connections that the server can handle is limited. If the attacker uses a large number of controlled hosts to send such incomplete requests and continues to occupy them, the connection resources will be exhausted (slowhttptest tool). A web server software such as iis nginx has been modified for this attack method, but web servers such as apache and dhttpd will still be attacked by slowloris.Liz Bonnin presents a controversial and provocative episode of Horizon, investigating how new scientific research is raising hard questions about zoos - the film explores how and why zoos keep animals, and whether they need to change to keep up with modern science or ultimately be consigned to history.Should zoos cull their animals to manage populations? Liz travels to Copenhagen Zoo, who killed a giraffe and fed it to the lions, to witness their culling process first hand. They think it is a natural part of zoo keeping that is often swept under the carpet. Should some animals never be kept in captivity? In a world exclusive, Liz visits SeaWorld in Florida and asks if captivity drove one of their orcas to kill his trainer.But could zoos be the answer to conserving endangered species? Liz examines their record, from helping breed pandas for the wild to efforts to save the rhinos. She meets one of the last surviving northern white rhinos and discovers the future of this species now lies in a multimillion-dollar programme to engineer them from stem cells. Veteran conservation scientist Dr Sarah Bexell tells Liz the science of captive breeding is giving humanity false hope.名次如何？杨长帆立了一个一的手势。Li Yifeng! ! ! ! ! ! ! ! !Power Supply Section张良不知道，刘邦心里想的更为复杂。某社团老大乘车夜归途中遭人枪杀，凶手不知去向。该社团围绕继承人问题展开争论，为避免出现分裂与争执，社团元老马公（午马 饰）与王律师（黄霑 饰）商议，委托老大之名指定正直勤奋的阿修（李修贤 饰）为帮会继承人。