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Ethernet also has preamble and inter-frame gap when transmitting. The preamble takes up 8 bytes (byte), or 64 bits. The first 7 bytes of the preamble are separated by 10101010, 1 and 0. However, the eighth byte becomes 10101011. When the host detects two consecutive 1s, it will know that there is data at the beginning. During network transmission, the data structure is as follows:1989年 ルパン三世バイバイリバティー?危机一発! 再见自由女神危机一刻！< button > Click me 呼……徐文长摇首长叹，只可惜，大多数军士没有船主这样的理智，为了一时之快，死也无妨。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.也未必会同时赶到，毕竟年纪要大一些。