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SMTP和HTTP协议一样都属于请求应答式协议

IT知识http协议

著论准过秦，作赋拟子虚。这篇文章主要讲述SMTP和HTTP协议一样都属于请求应答式协议相关的知识，希望能为你提供帮助。
电子邮件协议中POP3协议用于接收邮件，SMTP协议用于发送邮件。SMTP的全称为Simple Mail Transfer Protocol，也就是简单邮件传输协议，字如其名。



相较于POP3而言，SMTP确实比较简单。这里的简单并不是指SMTP的命令比POP3少，而是指SMTP的命令是有序的，而POP3的命令是无序的，理解这一点很重要。也就是说SMTP的命令是要组合在一起才能完成一次邮件发送任务，单独调用每个命令的意义不大。POP3命令则不同，LIST、STAT、UIDL、TOP、RETR、DELE等命令都可以独立使用，比如用LIST命令查看邮件清单，然后用RETR命令接收邮件。



简单的另一层含义是：就socket编程而言实现发送数据要比实现接收数据简单点。

比如接收数据时要判断数据是否接收完毕。如果一条数据以回车换行结束，就需要判断是否接收到了"\\r\\n"，从而确保读取到一条完整的消息体。而发送数据则不需要考虑上述问题，你可以按照自己的节奏发送数据，可以一次将整个消息体发送出去，也可以不用考虑服务器的死活一个字节一个字节发送数据，直至将整条消息发送完毕。

换句话说，接收数据要以流的方式进行，而不是简单的开辟一个缓冲区，进行一次recv操作。 虽然大部分情况下这种方式也没有问题，比如写个Demo程序，但如果要让你的网络程序非常健壮的话，最好以流的方式进行读取。因为并不是每次对方都会按照你期望的方式发送数据给你，比如，你开辟了1024字节缓冲区用于接收网络数据，但对方可能一次只给你发送一个字节，或者发出了1025个字节。



SMTP和HTTP协议一样都属于请求应答式协议，也就是一问一答，客户端发送命令后，服务器返回响应内容。 SMTP的响应格式和HTTP协议的基本一样，都是响应码+响应描述。响应码用三位数字表示，空格后则是响应信息的描述，只是HTTP协议会多一个版本信息。

这种一问一答式协议，在HTTP协议上体现的并不是很明显，只有HTTP连接设置为Keep-Alive时，你才有机会使用GET或POST命令反复与服务器进行交互，否则只有一次问答的机会。

但在SMTP协议下这种一问一答的交互方式就非常明显了。 主要原因是完成一次邮件的发送任务涉及到的步骤比较多，我把电子邮件的发送分为如下五个步骤：

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