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                            > SOCKET本質是編程接口(API)，對TCP/IP的封裝
>  SOCKET是應用層與傳輸層之間的橋梁
> SOCKET是以長連接的形式存在的
> 建立連接成功后，可以相互主動發送數據及接收數據

圖示解析：

![](https://box.kancloud.cn/b6d04abd4ffe5573408cc6c8607e3a17_657x381.jpg)

![](https://box.kancloud.cn/57848c1798d392a57a362c83d5a1453f_564x476.jpg)

![](https://box.kancloud.cn/ccd7e0d80ad26fc98562bc1e5542dbff_504x488.jpg)

參考鏈接：
HTTP協議中TCP的三次握手，四次揮手總結：https://www.cnblogs.com/zxh930508/p/5432700.html
HTTP與HTTPS的區別：https://www.cnblogs.com/wqhwe/p/5407468.html
關于socket的認識理解：http://blog.csdn.net/ccit0519/article/details/24790971
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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