Important example of P2P protocols- BT. Please learn it.

bt协议\bittorrent.rar
......\BitTorrent协议标准之数据包格式_PHPer.htm
......\bt 协议.mht
......\BT下载的工作原理及小知识.mht
......\BT协议分析 - 邹鑫的专栏 - CSDN博客.mht
......\BT协议简析（中英文版）.rar
bt协议

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