text: import tornado.web
  import tornado.ioloop
  
  class basicRequestHandler(tornado.web.RequestHandler):
      def get(self):
          self.set_header("Access-Control-Allow-Origin", "gcp-public-data-landsat.storage.googleapis.com")
          self.write(f"Served successfully.")
  
      def options(self):
          self.set_header("Access-Control-Allow-Origin", "gcp-public-data-landsat.storage.googleapis.com")
          self.set_header("Access-Control-Allow-Headers", "Content-Type")
          self.set_status(204)
          self.finish()
  
  if __name__ == "__main__":
      app = tornado.web.Application([
          (r"/", basicRequestHandler)
      ])
      port = 8888
      app.listen(port)
      print(f"Application is ready and listening on port {port}.")
      tornado.ioloop.IOLoop.current().start()