最简单的HTTP通讯过程

HTTP报文遵循ABNF(一种形式化的语法表示方式),空格或回车换行都有严格的规定,以此保证HTTP协议的实现

1、最简单的HTTP请求报文

  • 请求行:方法空格URI空格HTTP/*.*回车换行
  • 请求头(可选,以键值对的形式)
  • 空行(回车换行,这一个空行是有实际意义的,代表头与体的分隔,必须要有):回车换行
  • 请求体(可选)
GET /hello/world HTTP/1.1
Host: localhost:8080

2、最简单的HTTP响应报文

  • 响应行:HTTP/*.*空格状态码空格状态描述(可选)回车换行
  • 响应头(可选,以键值对的形式)
  • 空行(必需):回车换行
  • 响应体(可选,任意数据)
HTTP/1.1 200 
Content-Length: 11

Hello World

3、使用XShell进行终端模拟HTTP请求

[C:\~]$ telnet localhost 8080


Host 'localhost' resolved to ::1.
Connecting to ::1:8080...
Connection established.
To escape to local shell, press 'Ctrl+Alt+]'.
GET /hello/world HTTP/1.1
Host:localhost:8080

HTTP/1.1 200 
Content-Length: 11
Date: Sat, 02 Jan 2021 01:47:23 GMT

Hello WorldConnection closing...Socket close.

Connection closed by foreign host.

Disconnected from remote host(localhost:8080) at 09:47:44.

Type `help' to learn how to use Xshell prompt.
[C:\~]$ 

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