Using tornado with aiohttp (or other asyncio-based libraries)
<p>I want to use tornado with asyncio libraries like aiohttp and native python 3.5 coroutines, and it seems to be supported in the latest tornado release (4.3). However when using it in tornado event loop, the request handler hangs indefinitely. When not using aiohttp (i.e. without the lines <code>r = await aiohttp.get('http://google.com/')</code> and <code>text = await r.text()</code> below), the request handler proceeds as normal.</p>

<p>My test code is as follows:</p>

<pre><code>from tornado.ioloop import IOLoop
import tornado.web
import tornado.httpserver
import aiohttp

IOLoop.configure('tornado.platform.asyncio.AsyncIOLoop')


class MainHandler(tornado.web.RequestHandler):
    async def get(self):
        r = await aiohttp.get('http://google.com/')
        text = await r.text()
        self.write("Hello, world, text is: {}".format(text))

if __name__ == "__main__":
    app = tornado.web.Application([
        (r"/", MainHandler),
    ])
    server = tornado.httpserver.HTTPServer(app)
    server.bind(8888, '127.0.0.1')
    server.start()
    IOLoop.current().start()
</code></pre>