tornadoExample.py

from tornado.httpclient import HTTPClient

def synchronous_fetch(url):
    http_client = HTTPClient()
    response = http_client.fetch(url)
    return response.body


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from tornado.httpclient import AsyncHTTPClient

async def asynchronous_fetch(url):
    http_client = AsyncHTTPClient()
    response = await http_client.fetch(url)
    return response.body


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from tornado.httpclient import AsyncHTTPClient
from tornado import gen

@gen.coroutine
def async_fetch_gen(url):
    http_client = AsyncHTTPClient()
    response = yield http_client.fetch(url)
    raise gen.Return(response.body)


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from tornado.concurrent import Future

def async_fetch_manual(url):
    http_client = AsyncHTTPClient()
    my_future = Future()
    fetch_future = http_client.fetch(url)
    def on_fetch(f):
        my_future.set_result(f.result().body)
    fetch_future.add_done_callback(on_fetch)
    return my_future


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async def fetch_coroutine(url):
    http_client = AsyncHTTPClient()
    response = await http_client.fetch(url)
    return response.body


#