class SimpleApp(object):
    def __init__(self, *args, **kwargs):
        self.args = args
        self.kwargs = kwargs

    def __call__(self, environ, start_response):
        body = '<html><head><title>wsgi app</title></head><body><h1>hello wsgi</h1></body></html>'
        response_headers = [
            ("Content-type", "text/html"),
        ]

        start_response("200 OK", response_headers)
        return [body, ]