Djangoweb框架的本质

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HTTP协议

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，基于请求做出响应，客户都先请求，服务端做出对应的响应，按照http协议的请求协议发送请求，服务端按照http协议的响应协议来响应请求，这样的网络通信，我们就可以自己实现Web框架了。

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link rel="stylesheet" href="css.css">
    <link rel="icon" href="favicon.ico">
</head>
<body>
<h1>欢迎来到红浪漫,拖鞋手牌请拿好,楼上请,男宾三位</h1>
<img src="tupian.jpg" alt="">
</body>
<script src="js.js"></script>
</html>

html代码
html代码
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h1
    background-color: red;
    color: white;
css代码
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alert("楼下说滴对");
js代码

要想将服务器的html代码放在浏览器上,我们必须遵循http协议：

 HTTP协议

get的请求数据拼接在url中；

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post的请求数据在请求体中；

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web框架初识

每引入一个css或js或图片都需要向服务器请求一次拿到文件：

img js css 统称为静态文件

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D:\\python3\\python.exe D:/PycharmProjects/s20/Django/day01/一框架.py
GET / HTTP/1.1
Host: 127.0.0.1:9000
Connection: keep-alive
Cache-Control: max-age=0
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.131 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3
Accept-Encoding: gzip, deflate, br
Accept-Language: zh-CN,zh;q=0.9


GET /css.css HTTP/1.1
Host: 127.0.0.1:9000
Connection: keep-alive
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.131 Safari/537.36
Accept: text/css,*/*;q=0.1
Referer: http://127.0.0.1:9000/
Accept-Encoding: gzip, deflate, br
Accept-Language: zh-CN,zh;q=0.9


GET /tupian.jpg HTTP/1.1
Host: 127.0.0.1:9000
Connection: keep-alive
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.131 Safari/537.36
Accept: image/webp,image/apng,image/*,*/*;q=0.8
Referer: http://127.0.0.1:9000/
Accept-Encoding: gzip, deflate, br
Accept-Language: zh-CN,zh;q=0.9

GET /js.js HTTP/1.1
Host: 127.0.0.1:9000
Connection: keep-alive
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.131 Safari/537.36
Accept: */*
Referer: http://127.0.0.1:9000/
Accept-Encoding: gzip, deflate, br
Accept-Language: zh-CN,zh;q=0.9

客户端向浏览器发送的请求文件
客户端向浏览器发送的请求文件

框架演示：

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# -*- coding: utf-8 -*-
# @Time    : 2019/5/15 15:18
import re
import socket
from threading import Thread
sk = socket.socket()
sk.bind(("127.0.0.1",9000))
sk.listen()

def send_file(conn):
    msg = conn.recv(1024).decode(‘utf-8‘)
    conn.send(b"HTTP/1.1 200 ok \\r\\n\\r\\n")
    t = re.findall(".*? (/.*?) HTTP/1.1",msg)
    # print(t)    # 获取客户端请求的文件

    if t[0]=="/":   # GET / HTTP/1.1
        with open("html.html", "rb") as f:
            countent_html = f.read()
        conn.send(countent_html)
        conn.close()

    elif t[0]=="/css.css":  # GET /css.css HTTP/1.1
        with open("css.css", "rb") as f:
            countent_css = f.read()
        conn.send(countent_css)
        conn.close()

    elif t[0]=="/tupian.jpg":  # GET /tupian.jpg HTTP/1.1
        with open("tupian.jpg", "rb") as f:
            countent_jpg = f.read()
        conn.send(countent_jpg)
        conn.close()

    elif t[0]=="/js.js":   # GET /js.js HTTP/1.1
        with open("js.js", "rb") as f:
            countent_js = f.read()
        conn.send(countent_js)
        conn.close()

while True:
    conn,addr = sk.accept()
    # 开启多线程
    t = Thread(target=send_file,args=(conn,))
    t.start()
sk.close()

web框架二
web框架二
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# -*- coding: utf-8 -*-
# @Time    : 2019/5/15 15:18
import re
import socket
from threading import Thread
sk = socket.socket()
sk.bind(("127.0.0.1",9000))
sk.listen()

def html(conn):
    conn.send(b"HTTP/1.1 200 ok \\r\\n\\r\\n")
    with open("html.html", "rb") as f:
        countent_html = f.read()
    conn.send(countent_html)
    conn.close()

def css(conn):
    conn.send(b"HTTP/1.1 200 ok \\r\\n\\r\\n")
    with open("css.css", "rb") as f:
        countent_css = f.read()
    conn.send(countent_css)
    conn.close()

def js(conn):
    conn.send(b"HTTP/1.1 200 ok \\r\\n\\r\\n")
    with open("js.js", "rb") as f:
        countent_js = f.read()
    conn.send(countent_js)
    conn.close()

def tupian(conn):
    conn.send(b"HTTP/1.1 200 ok \\r\\n\\r\\n")
    with open("tupian.jpg", "rb") as f:
        countent_jpg = f.read()
    conn.send(countent_jpg)
    conn.close()

def img(conn):
    conn.send(b"HTTP/1.1 200 ok \\r\\n\\r\\n")
    with open("favicon.ico", "rb") as f:
        countent_ico = f.read()
    conn.send(countent_ico)
    conn.close()
file = [
    ("/",html),
    ("/css.css",css),
    ("/js.js",js),
    ("/tupian.jpg",tupian),
    ("/favicon.ico",img),
]
def send_file(conn,path):
    for i in file:
        if i[0]==path:
            Thread(target=i[1],args=(conn,)).start()

while True:
    conn,addr = sk.accept()
    msg = conn.recv(1024).decode("utf-8")
    t = re.findall(".*? (/.*?) HTTP/1.1", msg)
    send_file(conn,t[0])

web框架三
web框架三
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# -*- coding: utf-8 -*-
# @Time    : 2019/5/16 16:56

"""
wsgiref模块版web框架
"""

from wsgiref.simple_server import make_server

def index(environ):
    with open("index.html","rb") as f:
        content = f.read()
    return [content]

def home(environ):
    with open("home.html","rb") as f:
        content = f.read()
    return [content]
def log(environ):
    with open("favicon.ico","rb") as f:
        content = f.read()
    return [content]

li = [
    ("/",index),
    ("/home",home),
    ("favicon.ico",log),
]
def app(environ, start_response):
    # 封装响应信息
    start_response(‘200 OK‘, [(‘Content-Type‘, ‘text/html‘), (‘k1‘, ‘v1‘)])
    # environ 封装好的请求数据,字典的格式
    path = environ["PATH_INFO"]
    print(path)
    for i in li:
        if i[0] == path:
            ret = i[1](environ)
            return ret

# 绑定ip和端口,有人连接就调用app函数
httpp = make_server("127.0.0.1",9000,app)
# 开始监听http请求
httpp.serve_forever()

web框架四
web框架四

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