django(1)

web框架本质

所有的Web应用本质上就是一个socket服务端，而用户的浏览器就是一个socket客户端。这样我们就可以自己实现Web框架了。

import socket

sk = socket.socket()
sk.bind(("127.0.0.1", 80))
sk.listen()


while True:
    conn, addr = sk.accept()
    data = conn.recv(8096)
    print(data)  # 将浏览器发来的消息打印出来
    conn.send(b"OK")
    conn.close()

访问127.0.0.1:80  页面能显示ok字样
可以conn.send(b"OK")这种形式

GET / HTTP/1.1
Host: 127.0.0.1
Connection: keep-alive
Cache-Control: max-age=0
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.181 Safari/537.36 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8 Accept-Encoding: gzip, deflate, br Accept-Language: zh-CN,zh;q=0.9 Cookie: Hm_lvt_ba7c84ce230944c13900faeba642b2b4=1528700314; Hm_lpvt_ba7c84ce230944c13900faeba642b2b4=1528701771

非http版本的response header 信息 
有点晕了,为什么是一样的呢?

服务端打印的信息(浏览器发过来的信息)
b'GET /index HTTP/1.1\r\nHost: 127.0.0.1\r\nConnection: keep-alive\r\nCache-Control: max-age=0\r\nUpgrade-Insecure-Requests: 1\r\nUser-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.181 Safari/537.36\r\nAccept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8\r\nAccept-Encoding: gzip, deflate, br\r\nAccept-Language: zh-CN,zh;q=0.9\r\nCookie: Hm_lvt_ba7c84ce230944c13900faeba642b2b4=1528700314; Hm_lpvt_ba7c84ce230944c13900faeba642b2b4=1528700435\r\n\r\n'
b'GET /favicon.ico HTTP/1.1\r\nHost: 127.0.0.1\r\nConnection: keep-alive\r\nPragma: no-cache\r\nCache-Control: no-cache\r\nUser-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.181 Safari/537.36\r\nAccept: image/webp,image/apng,image/*,*/*;q=0.8\r\nReferer: http://127.0.0.1/index\r\nAccept-Encoding: gzip, deflate, br\r\nAccept-Language: zh-CN,zh;q=0.9\r\nCookie: Hm_lvt_ba7c84ce230944c13900faeba642b2b4=1528700314; Hm_lpvt_ba7c84ce230944c13900faeba642b2b4=1528700435\r\n\r\n'

第一段有请求方法,用户访问页面的路径,
只有str能被split,bytes类型不能

import socket

sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.bind(('127.0.0.1', 8000))
sock.listen()

while True:
    conn, addr = sock.accept()
    data = conn.recv(8096)
    # 给回复的消息加上响应状态行
    conn.send(b"HTTP/1.1 200 OK\r\n\r\n")
    conn.send(b"OK")
    conn.close()

http版

GET / HTTP/1.1
Host: 127.0.0.1:8000
Connection: keep-alive
Cache-Control: max-age=0
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.181 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8
Accept-Encoding: gzip, deflate, br
Accept-Language: zh-CN,zh;q=0.9
Cookie: Hm_lvt_ba7c84ce230944c13900faeba642b2b4=1528700314; Hm_lpvt_ba7c84ce230944c13900faeba642b2b4=1528701753

http版本的response header 信息

b'GET / HTTP/1.1\r\nHost: 127.0.0.1:8000\r\nConnection: keep-alive\r\nCache-Control: max-age=0\r\nUpgrade-Insecure-Requests: 1\r\nUser-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.181 Safari/537.36\r\nAccept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8\r\nAccept-Encoding: gzip, deflate, br\r\nAccept-Language: zh-CN,zh;q=0.9\r\nCookie: Hm_lvt_ba7c84ce230944c13900faeba642b2b4=1528700314; Hm_lpvt_ba7c84ce230944c13900faeba642b2b4=1528702117\r\n\r\n'
b'GET /favicon.ico HTTP/1.1\r\nHost: 127.0.0.1:8000\r\nConnection: keep-alive\r\nUser-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.181 Safari/537.36\r\nAccept: image/webp,image/apng,image/*,*/*;q=0.8\r\nReferer: http://127.0.0.1:8000/\r\nAccept-Encoding: gzip, deflate, br\r\nAccept-Language: zh-CN,zh;q=0.9\r\nCookie: Hm_lvt_ba7c84ce230944c13900faeba642b2b4=1528700314; Hm_lpvt_ba7c84ce230944c13900faeba642b2b4=1528702117\r\n\r\n'

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