WEB集群--HTTP协议

HTTP概述

默认端口：80

HTTP(超文本传输协议)：数据请求与响应

请求request：访问网站

响应response：显示网站，返回客户端想要的内容

# curl -v www.baidu.com
# wget --debug www.baidu.com

---request begin---
GET / HTTP/1.1
User-Agent: Wget/1.14 (linux-gnu)
Accept: */*
Host: baidu.com
Connection: Keep-Alive

---request end---
HTTP request sent, awaiting response... 
---response begin---
HTTP/1.1 200 OK
Date: Mon, 16 Dec 2024 06:40:08 GMT
Server: Apache
Last-Modified: Tue, 12 Jan 2010 13:48:00 GMT
ETag: "51-47cf7e6ee8400"
Accept-Ranges: bytes
Content-Length: 81
Cache-Control: max-age=86400
Expires: Tue, 17 Dec 2024 06:40:08 GMT
Connection: Keep-Alive
Content-Type: text/html

---response end---
200 OK
Registered socket 3 for persistent reuse.
Length: 81 [text/html]
Saving to: ‘index.html’

HTTP 1.0是一个无状态和无连接的协议，它不支持持久连接，每次请求都需要建立新的TCP连接。

HTTP协议版本