增加了web协议与抓包实战第二章笔记

tcp/Web 协议详解与抓包实战/2、WebSocket 协议.md

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+> [TOC]
+
+# 1、Websocket解决什么问题？
+
+## 1.1、如何即使获取更新？
+
+![image-20220813182212662](assets/image-20220813182212662.png)
+
+## 1.2、如何分析Websocket
+
+![image-20220813182649381](assets/image-20220813182649381.png)
+
+## 1.3、定义
+
+![image-20220813182958124](assets/image-20220813182958124.png)
+
+# 2、Websocket的约束
+
+## 2.1、Websocket的成本
+
+![image-20220813183539131](assets/image-20220813183539131.png)
+
+![image-20220813184000955](assets/image-20220813184000955.png)
+
+![image-20220813184052353](assets/image-20220813184052353.png)
+
+## 2.2、设计哲学
+
+![image-20220813184115532](assets/image-20220813184115532.png)
+
+# 3、Websocket协议格式
+
+![image-20220813184344064](assets/image-20220813184344064.png)
+
+![image-20220813184959440](assets/image-20220813184959440.png)
+
+![image-20220813185012044](assets/image-20220813185012044.png)
+
+![image-20220813185146477](assets/image-20220813185146477.png)
+
+# 4、Websocket协议如何从HTTP升级？
+
+## 4.1、提供的消息
+
+![image-20220813185305956](assets/image-20220813185305956.png)
+
+## 4.2、建立握手
+
+![image-20220813185636652](assets/image-20220813185636652.png)
+
+## 4.3、如何验证成功连接？
+
+![image-20220813185841585](assets/image-20220813185841585.png)
+
+# 5、传递消息的编码格式
+
+## 5.1、定义
+
+![image-20220813190052971](assets/image-20220813190052971.png)
+
+![image-20220813191402368](assets/image-20220813191402368.png)
+
+## 5.2、帧的长度
+
+![image-20220813191624615](assets/image-20220813191624615.png)
+
+## 5.3、发送消息
+
+![image-20220813192052277](assets/image-20220813192052277.png)
+
+# 6、掩码处理
+
+## 6.1、为什么？
+
+![image-20220813192251313](assets/image-20220813192251313.png)
+
+## 6.2、定义
+
+![image-20220813194103292](assets/image-20220813194103292.png)
+
+## 6.3、原理
+
+![image-20220813194123218](assets/image-20220813194123218.png)
+
+# 7、如何维护会话？
+
+![image-20220813194409362](assets/image-20220813194409362.png)
+
+# 8、如何关闭会话？
+
+![image-20220813194608277](assets/image-20220813194608277.png)
+
+![image-20220813194616116](assets/image-20220813194616116.png)
+
+![image-20220813194622025](assets/image-20220813194622025.png)