python拥有这种单独起一个服务器监听端口的能力，用标准库的wsgiref就行。

from wsgiref.simple_server import make_server

def simple_app(environ, start_response):

    status = '200 OK'

    response_headers = [('Content-type','text/plain')]

    start_response(status, response_headers)

    return ['Hello world!\n']

httpd = make_server('', 80, simple_app)

httpd.serve_forever()