def __call__(self, environ, start_response):
    request = Request(environ)
    response = Response()
    response.text = 'Hello, World!'
    return response(environ, start_response)
def __call__(self, environ, start_response):
    request = Request(environ)
    response = Response()
    response.text = 'Hello, World!'
    return response(environ, start_response)