Combining requests-futures with uvicorn

I’m trying to use requests-futures with uvicorn. Currently, this fails with a ConnectionError stemming from urllib3. I can run the below code just fine normally but when I await the same coroutine from an API Star request handler there is the mentioned error and I see the following warning:

[asyncio] [WARNING] Executing <Task finished coro=<RequestResponseCycle.run_asgi() done, defined at /usr/local/lib/python3.6/site-packages/uvicorn/protocols/http/httptools_impl.py:381> result=None created at /usr/local/lib/python3.6/site-packages/uvicorn/protocols/http/httptools_impl.py:272> took 5.026 seconds

Maybe that means the requests are not properly run using a ThreadPoolExecutor?

import asyncio

import uvloop
from requests_futures.sessions import FuturesSession


async def make_requests():
    session = FuturesSession(max_workers=1)
    # first request is started in background
    future_one = session.get('http://httpbin.org/get')
    # second requests is started immediately
    future_two = session.get('http://httpbin.org/get?foo=bar')
    # wait for the first request to complete, if it hasn't already
    response_one = future_one.result()
    print('response one status: {0}'.format(response_one.status_code))
    print(response_one.content)
    # wait for the second request to complete, if it hasn't already
    response_two = future_two.result()
    print('response two status: {0}'.format(response_two.status_code))
    print(response_two.content)


asyncio.set_event_loop_policy(uvloop.EventLoopPolicy())
loop = asyncio.get_event_loop()
try:
    loop.run_until_complete(make_requests())
finally:
    loop.close()

[Midnighter]

And it all turned out to be a DNS problem with docker-compose 😡

[Midnighter]

You can solve it by directly defining the DNS IP in your docker-compose.yml. Something like:

services:
  web:
    dns:
    - 8.8.8.8
    - 8.8.4.4