foo.py

import tornado.httpserver
import tornado.ioloop
import tornado.web

import time

class FeedgetService(tornado.web.RequestHandler):
    
    #i'm willing that method will run async
    @tornado.web.asynchronous
    def get(self, url):
        print("trying for " + url)
        time.sleep(10)
        self.write("fetched data for " + url)
        self.finish()

application = tornado.web.Application([
    (r"/test/(.*)", FeedgetService),
])

if __name__ == "__main__":
    http_server = tornado.httpserver.HTTPServer(application)
    http_server.listen(8888)
    tornado.ioloop.IOLoop.instance().start()