Python on MacOS complains that urllib3 only supports OpenSSL 1.1.1+, but ssl is compiled with LibreSSL 2.8.3

[thutt]

When using the --url option (initially only on the
development-http-dossier branch), macos shows the following diagnostic
on the console.

.../Library/Python/3.9/lib/python/site-packages/urllib3/init.py:35: NotOpenSSLWarning: urllib3 v2 only supports OpenSSL 1.1.1+, currently the 'ssl' module is compiled with 'LibreSSL 2.8.3'. See: urllib3/urllib3#3020

If the --url option is not used, the diagnostic is not shown.

There are four suggested ways to address the situation:

Solution 1: Use Python from Homebrew (Recommended)
bash

Install Python via Homebrew (comes with proper OpenSSL)

brew install python@3.11 # or python@3.12

Use the Homebrew Python

/opt/homebrew/bin/python3 -m pip install --upgrade urllib3 requests PyQt6

Run your app with Homebrew Python

/opt/homebrew/bin/python3 vrt.py

Solution 2: Suppress the Warning (Quick Fix)

If you can't change Python installations, you can suppress the warning
by adding this at the top of fetchurl.py:

python

import warnings
import urllib3

Suppress LibreSSL warning

warnings.filterwarnings('ignore', message='.urllib3.',
category=urllib3.exceptions.NotOpenSSLWarning)

Solution 3: Use Python from python.org

Download and install Python from
https://www.python.org/downloads/macos/ - these builds include proper
OpenSSL support.

Solution 4: Downgrade urllib3

As a last resort, you can use an older urllib3 that doesn't have this check:
bash

pip install 'urllib3<2.0'