On exception it returns xx (Caused By None), whereas the requests module returns xx (Caused By xx)

[iamsstef]

When an exception is thrown it does return (Caused By None) so i can't know the details of the error. For example that's what requests module throws on that specific error: HTTPSConnectionPool(host='*********', port=443): Max retries exceeded with url: ******* (Caused by SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:997)')))

and here is what requests futures throws: None: Max retries exceeded with url: ***** (Caused by None)

[ross]

Can you provide a snippet of code you're using when you run into the error? I've tried and have been unable to reproduce that behavior, e.g. if I hit something that has a self-signed cert:

#!/usr/bin/env python3

from requests_futures.sessions import FuturesSession

session = FuturesSession()
future = session.get('https://self-signed.badssl.com/')
try:
    future.result()
except Exception as e:
    print(e)

$ ./test.py
HTTPSConnectionPool(host='self-signed.badssl.com', port=443): Max retries exceeded with url: / (Caused by SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: self signed certificate (_ssl.c:997)')))

[ross]

I get the same result with as_completed:

from concurrent.futures import as_completed
from requests_futures.sessions import FuturesSession

session = FuturesSession()
futures = [
    session.get('https://self-signed.badssl.com/'),
    session.get('https://untrusted-root.badssl.com/'),
]

for future in as_completed(futures):
    try:
        future.result()
    except Exception as e:
        print(e)

$ test.py
HTTPSConnectionPool(host='untrusted-root.badssl.com', port=443): Max retries exceeded with url: / (Caused by SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: self signed certificate in certificate chain (_ssl.c:997)')))
HTTPSConnectionPool(host='self-signed.badssl.com', port=443): Max retries exceeded with url: / (Caused by SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: self signed certificate (_ssl.c:997)')))

This is with python 3.10

$ python --version
Python 3.10.8

[iamsstef]

tbh i switched to aiohttp because i couldn't figure it out, i'm trying to reproduce it again now within my code, because out of my script's function seems to produce the expected error. If i remember correctly the function was being called via asyncio.create_task. I will close the issue and if i will manage to reproduce it i'll re-open it. Thank you for your time.

[ross]

Ah, problems generally arrise when mixing async types. It may be that asyncio and python threads/futures don't place nicely with each other.