tornado.gen.engine.py

import tornado.ioloop
import tornado.web
import tornado.gen
import tornado.httpclient


class GenAsyncHandler(tornado.web.RequestHandler):
    @tornado.web.asynchronous
    @tornado.gen.engine
    def get(self):
		http_client = tornado.httpclient.AsyncHTTPClient()
		response = yield tornado.gen.Task(http_client.fetch, "http://example.com")
		print response, dir(response)
		print response.error
		self.finish('Fin.')

application = tornado.web.Application([
    (r"/", GenAsyncHandler),
])

if __name__ == "__main__":
    application.listen(8889)
    tornado.ioloop.IOLoop.instance().start()