This example shows how to use the tornado AsyncHTTPClient concurrently to perform multiple gets

concurrent_tornado_fetches.py

from tornado import gen, web, ioloop, httpclient
import json


class MainHandler(web.RequestHandler):

    @gen.coroutine
    def get(self):
        http_client = httpclient.AsyncHTTPClient()
        time, ip, headers = yield [http_client.fetch("http://time.ioloop.io?format=json"),
                                   http_client.fetch("http://ip.ioloop.io?format=json"),
                                   http_client.fetch("http://headers.ioloop.io?format=json")]
        self.write({
            "time": json.loads(time.body),
            "ip": json.loads(ip.body),
            "headers": json.loads(headers.body)
        })

app = web.Application([("/", MainHandler)], debug=True)
app.listen(8888)
ioloop.IOLoop.current().start()

import time
import tornado.web
from tornado.ioloop import IOLoop
from tornado import gen


class MainHandler(tornado.web.RequestHandler):
    @tornado.web.asynchronous
    @gen.engine
    def get(self):
        self.write("hello ")
        yield gen.Task(IOLoop.instance().add_timeout, time.time() + 1)
        self.write("world")
        self.finish()


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


if __name__ == "__main__":
    application.listen(8888)
    IOLoop.instance().start()