from http.server import BaseHTTPRequestHandler, HTTPServer


class RequestHandler(BaseHTTPRequestHandler):
    def _set_headers(self):
        self.send_response(200)
        self.send_header('Content-type', 'text/plain')

    def do_GET(self):
        self._set_headers()
        self.wfile.write(b'OK')
    
    def send_error(self, code, message=None, explain=None):
        pass


def run(server_class=HTTPServer, handler_class=RequestHandler, port=5000):
    server_address = ('', port)
    httpd = server_class(server_address, handler_class)
    httpd.serve_forever()


if __name__ == "__main__":
    from sys import argv

    if len(argv) == 2:
        run(port=int(argv[1]))
    else:
        run()