Fixes #90 SSL Context verification purpose with client SSL authentication

[udokmeci-eiq]

Fix #90 SSL Context verification purpose with client SSL authentication

Issue

When making HTTPS requests, the following error occurred:

urllib.error.URLError: <urlopen error Cannot create a client socket with a PROTOCOL_TLS_SERVER context (_ssl.c:809)>

This issue was caused by an incorrect SSL context configuration, where ssl.Purpose.CLIENT_AUTH was used instead of ssl.Purpose.SERVER_AUTH.

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Root Cause

• ssl.Purpose.CLIENT_AUTH is intended for servers verifying client certificates, not for clients verifying a server’s certificate.
• Since this is a client-side HTTPS request, it should use ssl.Purpose.SERVER_AUTH.

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Solution

Updated the SSL context creation to use ssl.Purpose.SERVER_AUTH:

[eric-eclecticiq]

Could you add a note in CHANGES.rst ?

[jamesoc-eiq]

Looks good.
Key context to the issue can be seen here:
https://github.com/python/cpython/blob/4d0d24f6e3dff2864007c3cfd1cf7d49c6ee5317/Lib/ssl.py#L696