Problems experienced with SSL certificates using requests library

[RobPasMue]

As reported by @kmahajan-cadfem, he has experienced issues when downloading Python using the Ansys Python Manager. Errors seem to be related to SSL Certificate verification when using the requests library. One option would be to implement as a fail-safe a powershell web request directly. See #82 for more details.

Proposed solution by @kmahajan-cadfem:

one solution could be to just create a powershell web request, instead of python requests. (as fail safe)

Invoke-RestMethod 'https://www.python.org/ftp/python/3.10.0/python-3.10.0-amd64.exe' -Method 'GET'  -OutFile "python-3.10.0.exe"

or just use wget, should be available on windows as well under powershell.

Originally posted by @kmahajan-cadfem in #82 (comment)

[RobPasMue]

@kmahajan-cadfem could you try something on the script you posted on #82 (comment)

Try calling it as follows:

    session = requests.Session()
    response = session.get(
        url, allow_redirects=True, stream=True, headers=request_headers, verify=False
    )

Main difference is adding the last argument: verify=False. Check if it works like that

[RobPasMue]

Another option after this first trial would be to run pip install --upgrade certifi, updating symlinks to certificates and then running it without the verify=False argument.

More info is here https://stackoverflow.com/a/4233435. Though it is especially oriented for OSX it should be applicable everywhere :)

This is just a different attempt to understand the root cause.

[kmahajan-cadfem]

@kmahajan-cadfem could you try something on the script you posted on #82 (comment)

Try calling it as follows:

    session = requests.Session()
    response = session.get(
        url, allow_redirects=True, stream=True, headers=request_headers, verify=False
    )

Main difference is adding the last argument: verify=False. Check if it works like that

I do not get any errors, but download is also not working
it just does not do anything, gives out a warning

d:\users\mkanchan\pyansys_venvs\mytest\lib\site-packages\urllib3\connectionpool.py:1052: InsecureRequestWarning: Unverified HTTPS request is being made to host '[www.python.org](https://www.python.org/)'. Adding certificate verification is strongly advised. See: https://urllib3.readthedocs.io/en/1.26.x/advanced-usage.html#ssl-warnings
  InsecureRequestWarning,

same goes after installation of certifi

[RobPasMue]

Okay got it. Let's go with the powershell commands then. Thanks for testing it @kmahajan-cadfem!

[RobPasMue]

Hi @kmahajan-cadfem! We just did a new release 0.2.0!! In this release, we included a potential solution for your issue, could you check if it works for you now? Thanks in advance! You can easily update your app version by clicking on File >> Check for updates on your Ansys Python Manager installation. Looking forward to your feedback =)

[kmahajan-cadfem]

Hi @RobPasMue
Thanks for quick fix.

1. This works for downloading now, I cannot install Python because of Admin Rights. That is fine for now.
2. I have also encountered SSL problem with updater

I am not really sure where these SSL problems are arising from exactly, because I can access everything over the browser without any problems.

[RobPasMue]

Interesting... that happened when updating the app through the File >> Check for updates mechanism?

[RobPasMue]

I will open a new issue for tracking this