[5.1 http请求和响应](5.1http%E8%AF%B7%E6%B1%82%E5%92%8C%E5%93%8D%E5%BA%94.md) [5.2 socket](5.2socket.md) [5.3 WebSocket](5.3WebSocket.md) [5.4 打印客户端头部信息](5.4%E6%89%93%E5%8D%B0%E5%AE%A2%E6%88%B7%E7%AB%AF%E5%A4%B4%E9%83%A8%E4%BF%A1%E6%81%AF.md)