socket 简单实现HTTP服务器

# -*- coding: utf-8 -*-
# @Time : 2019-07-17 1:39
# @File : 网络socket实现http服务器.py
# @Software: PyCharm

import socket
import re


def server_conn(conn,file_name):
    # 1.响应头部
    if file_name == '/index.html':
        # 可换成HTML本地文件
        response = "HTTP/1.1 200 OK \r\n"
        # 2.响应body
        response += "\r\n"
        response += "<h1> index </h1>"
        # 3.发送请求
        conn.sendall(bytes(response, encoding="utf-8"))
    else:
        response = "HTTP/1.1 404 OK \r\n"
        # 2.响应body
        response += "\r\n"
        response += "<h1> pages not found </h1>"
        # 3.发送请求
        conn.sendall(bytes(response, encoding="utf-8"))
    pass


def main(host, port):
    # 1.创建套接字
    server = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
    server.setsockopt(socket.SOL_SOCKET,socket.SO_REUSEADDR,1)
    # 2.绑定
    server.bind((host, port))
    # 3.监听
    server.listen(128)
    # 4.连接
    while True:
        conn, address = server.accept()
        # 接收客户端消息，最大字节数1024
        client_mess = conn.recv(1024)
        # 接收浏览器返回数据
        client_content = str(client_mess, encoding="utf-8").splitlines()
        # 切割匹配访问路径
        file_name = re.match(r"[^/]+(/[^ ]*)",client_content[0])
        if file_name:
            file_name1 = file_name.group(1)
            if file_name1 == "/":
                file_name1 = "/index.html"
            print(file_name1)
        # print(client_content)
        server_conn(conn,file_name1)
        conn.close()
    pass


if __name__ == "__main__":
    main("127.0.0.1", 7890)

# 注 ： http协议，三次握手，四次挥手