Timeout with HEAD method of AsyncHTTPClient on valid URL

I can't get AsyncHTTPClient to do a simple HEAD request.

Not working:

#!/usr/bin/env python
import logging
from tornado import ioloop
from tornado.web import gen
from tornado.httpclient import AsyncHTTPClient
logging.basicConfig(level=logging.DEBUG)


@gen.coroutine
def test():
    url = "https://r4---sn-8vq54vox2u-apne.googlevideo.com/videoplayback?aitags=133%2C134%2C135%2C136%2C160&sparams=aitags%2Cclen%2Cdur%2Cei%2Cgir%2Cid%2Cinitcwndbps%2Cip%2Cipbits%2Citag%2Ckeepalive%2Clmt%2Cmime%2Cmm%2Cmn%2Cms%2Cmv%2Cpl%2Crequiressl%2Csource%2Cexpire&mime=video%2Fmp4&id=o-AK1r9zLt8iQEN-zyIbOXynTtGcj201h1Qivmb4INkx0Q&itag=135&dur=125.600&lmt=1380999388644463&ip=94.62.195.82&key=yt6&expire=1516640181&clen=2196699&signature=53D81AE57372BADC88F66B6B33EB220E42847E10.B3EAC4C02578FFBAA553A47652BE63312A8DFF7D&ms=au&ei=VcNlWq62DtilWOP7m8AB&mv=m&mt=1516618492&ipbits=0&mn=sn-8vq54vox2u-apne&mm=31&requiressl=yes&keepalive=yes&pl=16&source=youtube&gir=yes&initcwndbps=940000&ratebypass=yes"
    client = AsyncHTTPClient()
    try:
        response = yield client.fetch(url, method="HEAD", validate_cert=False)
        print response.status
        print response.headers
    except:
        logging.exception("error")

    ioloop.IOLoop.current().stop()


if __name__ == '__main__':
    test()
    ioloop.IOLoop.current().start()

working just fine:

import requests
url = "https://r4---sn-8vq54vox2u-apne.googlevideo.com/videoplayback?aitags=133%2C134%2C135%2C136%2C160&sparams=aitags%2Cclen%2Cdur%2Cei%2Cgir%2Cid%2Cinitcwndbps%2Cip%2Cipbits%2Citag%2Ckeepalive%2Clmt%2Cmime%2Cmm%2Cmn%2Cms%2Cmv%2Cpl%2Crequiressl%2Csource%2Cexpire&mime=video%2Fmp4&id=o-AK1r9zLt8iQEN-zyIbOXynTtGcj201h1Qivmb4INkx0Q&itag=135&dur=125.600&lmt=1380999388644463&ip=94.62.195.82&key=yt6&expire=1516640181&clen=2196699&signature=53D81AE57372BADC88F66B6B33EB220E42847E10.B3EAC4C02578FFBAA553A47652BE63312A8DFF7D&ms=au&ei=VcNlWq62DtilWOP7m8AB&mv=m&mt=1516618492&ipbits=0&mn=sn-8vq54vox2u-apne&mm=31&requiressl=yes&keepalive=yes&pl=16&source=youtube&gir=yes&initcwndbps=940000&ratebypass=yes"
r = requests.request('HEAD', url)
print r.headers

Start with the AsyncHTTPClient.fetch call in the reproducer and compare its HEAD request behavior with the working requests example. Verify the behavior against the supplied valid URL; done means the asynchronous request completes and exposes the response status and headers instead of timing out.