构建返回对应页面的web服务器

本次的服务器是在使用了 正则解析 http的请求报文，提取报文中的请求文件路径，然后读取对应的文件路径进行。

import socket
import re


def service_client(new_socket):
    request = new_socket.recv(1024).decode("utf-8")
    #把请求到的字符串切割为列表
    request_lines = request.splitlines()

    #GET /html HTTP/1.1 
    #进行正则匹配
    ret = re.match(r"[^/]+(/[^ ]*)",request_lines[0])
    #只有当正则匹配到东西之后，才进行group获取
    if ret:
        file_name = ret.group(1)
        if file_name == "/":
            file_name = "/index.html"
            
      #对于文件的打开需要额外的注意
    try:
        f = open("./html" + file_name, "rb")
    except:
        response = "HTTP/1.1 404 NOT FOUND\r\n"
        response += "\r\n"
        response += "-----file not found-----"
        new_socket.send(response.encode("utf-8"))
    else:
        response = "HTTP/1.1 200 ok\r\n"
        response += "\r\n"
        html_content = f.read()
        new_socket.send(response.encode("utf-8"))
        new_socket.send(html_content)

    new_socket.close()
    
def main():
    tcp_socket = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
    tcp_socket.setsockopt(socket.SOL_SOCKET,socket.SO_REUSEADDR,1)
    tcp_socket.bind(("",7788))
    tcp_socket.listen(128)
    while True:
        new_socket,client_addr = tcp_socket.accept()
        service_client(new_socket)

    tcp_socket.close()

if __name__ == "__main__":
    main()

1，try-except-else的书写模式
2，请求报文和应答报文的特点
3，正则的匹配