wsgi.py

from wsgiref.simple_server import make_server


class Application:

    def __init__(self, environ, start_response):
        self.environ = environ 
        self.start_response = start_response

    def __iter__(self):
       self.start_response(
           '200 OK', 
           [('Content-type', 'text/html')]
       )
       yield b'Hello!' 

    
httpd = make_server('', 8800, Application)
httpd.serve_forever()