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The attacker first completes the three-way handshake to establish the connection, but in the last ACK reply of the three-way handshake, the TCP window size is set to 0, and then a data request is made. When the attack target sends the request result to the attacker, it stops the data transmission when it finds that the TCP window size is 0, and sends out a TCP window detection packet to ask the attacker if the TCP window has been updated. Since the attacker will not update the window size, the attack target will always maintain the TCP connection and wait for the data to be sent, and continuously carry out TCP window size detection. When the number of controlled hosts in the botnet is large, Target's connection table will gradually be exhausted, resulting in denial of service.ChongqingFor example, in the back-end system, There are tabular data, Each piece of data is preceded by a check box button, When you click the check box button, After obtaining the id, it needs to be passed to the server to send an ajax request. The server needs to record this data, To request, if we send an http request to the server every time we click, For the server, the pressure is relatively high and the network requests are frequent. However, if the real-time data of the system is not very high now, we can collect all ID for a period of time (e.g. 2-3 seconds) through a proxy function and send AJAX requests to the server at one time. Relatively speaking, the network requests are reduced and the server pressure is reduced.昭和四大奥特曼与平成四大奥特曼的豪华大集结！这个项目融合了求生题材、恐怖故事以及成长故事等多种元素。故事的主角是一群才华横溢的高中女生足球队运动员。一场飞机失事之后，这群有着天赋的女孩子们成为了幸存者，试图在安大略省的山区里寻找新生。这是一个关于整个群体集体求生的故事，也将会观察她们在事故25年之后试图重新团结起来的生活。原来过去的事情并不会那样被轻易抹掉，而曾在山区里发生的事也远远没有结束。