Requests is running with a non urllib3 backend - NoCertificateRetrievedWarning

[sdmorel]

Hello,

I'm testing Rundeck with WinRM against a Windows server using NTLM authentication.
I run into a similar situation to the one described here requests/requests-kerberos#128

I followed the same steps, added some print lines at L198

print(raw_response.__class__)
print(HTTPResponse)

And got:

<class 'urllib3.response.HTTPResponse'>
<class 'requests.packages.urllib3.response.HTTPResponse'>

I'm not sure what's the reason for the check at L185. But when I replaced it with a if True:

I got no warnings or errors and the process (copy a PowerShell script and run it) finished successfully.

Then I added this to L194 and saw exactly that message in the output.

print("No certificate received from peer")

My env:

# pip freeze | grep requests
requests==2.22.0
requests-kerberos==0.12.0
requests-ntlm==1.1.0

So, is there a way to fix the check at L185?