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"State Mode"In TCP implementation, when receiving the SYN request from the client, the server needs to reply the SYN + ACK packet to the client, and the client also needs to send the confirmation packet to the server. Usually, the initial serial number of the server is calculated by the server according to certain rules or adopts random numbers. However, in SYN cookies, the initial serial number of the server is obtained by hash operation and encryption of the client IP address, client port, server IP address, server port and other security values, which is called cookie. When the server suffers from SYN attack and makes the backlog queue full, the server does not reject the new SYN request, but replies the cookie (SYN serial number of the reply packet) to the client. If it receives the ACK packet from the client, the server subtracts 1 from the ACK serial number of the client to obtain the cookie comparison value, and performs a hash operation on the above elements to see if it is equal to the cookie. If equal, complete the three-way handshake directly (Note: At this time, you don't need to check whether this connection belongs to the backlog queue).《有色眼镜》改编自曾在全美引起轰动的真实故事。本片讲述了一起臭名昭著的冤案：五名有着“中央公园五人帮”之称的青少年被错判为强奸罪。 这部四集的限定剧将聚焦哈莱姆区的五名青少年，即安特罗尼 ·麦克雷、 凯文·理查德森、尤瑟夫·萨拉姆、雷蒙德·桑塔纳和科里·怀斯。故事始于 1989 年春天，当时这些青少年第一次因此强奸事件而被问询。整个故事将跨越 25 年，高潮部分为 2002 年他们最终无罪释放，并于 2014 年与纽约市达成和解协议。北方农村女青年二凤高考落榜后在家务农，恰逢在农科院工作的男青年田辛来村里寻找试验田搞绿色开发，兴致勃勃的二凤参与了田辛的实验，并在田辛及父亲田雨的指点下，掌握了大棚葡萄种植技术，与此同时她与田辛的爱情也悄然萌芽了。二凤以四十棵葡萄苗白手起家，辛勤耕耘并逐渐发展成为一家经营农产品的“绿梦公司”，在事业有声有色的同时，却因为与田辛的相爱而使村人及家人产生了误会，由此结下了化解不开的恩怨纠葛。在传统和现代的观念碰撞中，在事业和情感的矛盾冲突下，二凤割舍了自己的爱情，坦然接受了命运的安排，并凭借自己的智慧和热情在深爱的土地上开垦出一片农村改革的处女地。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.腾讯视频大型自制纪录片《风味人间》将讲述全球范围内以美食为线索的人文故事。在全球视野里审视中国美食的独特性，在历史演化过程中探究中国美食的流变，深度讨论中国人与食物的关系，并勾勒出恢弘的中华美食地图，从美食中折射出中国人民族个性的侧面。《风味人间》历时四年精心准备，全片共8集，将于2018年在腾讯视频平台独家播出。《风味人间》将关注更加宏大的美食世界，触及更广泛人群的美食情结，在美食纪录片领域树立全新的标杆。总导演陈晓卿全心投入，带领中国最优秀的纪录片制作团队，历时四年，挖掘深度与广度兼具的创作题材，将为观众呈现全新的视听盛宴。