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                            [TOC]

## HTTP
HTTP(HyperTextTransferProtoco:超文本傳輸協議)

- HTTP協議是可靠的數據傳輸協議
- HTTP 是明文傳輸


## CDN
CDN( Content Delivery Network:內容分發網絡)

對多媒體內容加速


## HTTPS
Https(Secure)是安全的HTTP協議
## SSL
SSL( Secure sockets Layer:安全套接層
數據安全和數據完整
對傳輸層數據進行加密后傳輸

SSL 位于在應用層和傳輸層之間

### HTTPS 流程
1. 443 端口的TCP鏈接
2. SSL 安全參數握手
3. 客戶端發送數據
4. 服務器端發送數據

### SSL 安全參數握手流程
![](https://img.kancloud.cn/9a/91/9a91857b97fd666ee8f277a86eab9663_2694x1174.png)
![](https://img.kancloud.cn/cb/d6/cbd6071bec1dc1bc5eb33c31b96ad249_2682x1102.png)
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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