python http、模拟服务器返回相关页面（简单案例）

[code]import socket
import re

def request_service(new_socket):
"""为这个客户端返回数据"""
#接受浏览器发过来的请求，即http请求
recv_data = new_socket.recv(1024).decode("utf-8")
request_lines = recv_data.splitlines()
#if len(request_lines) == 0:
#request_service(new_socket)

file_name = ""
#正则表达式
ret = re.match(r"[^/]+(/[^ ]*)", request_lines[0])
if ret:
file_name = ret.group(1)
if file_name == "/":
file_name = "/index.html"
print("@"*45)
print(file_name)
#返回http格式的数据，给浏览器
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:
html_content = f.read()
f.close()
#准备发送给浏览器的数据---header
response = "HTTP/1.1 200 OK\r\n\r\n"
#将response header发给浏览器
new_socket.send(response.encode("utf-8"))
#将response body发送给浏览器
new_socket.send(html_content)
#关闭套接字
new_socket.colse()

def main():
#创建套接字
tcp_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
tcp_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR,2)
#绑定本地信息
tcp_socket.bind(("", 4545))
#套接字变被动
tcp_socket.listen(128)
while True:
#等待链接
new_socket, client_addr = tcp_socket.accept()
request_service(new_socket)
if __name__ =="__main__":
main()