bpo-31704 Check HTTP response in uppercase #3870
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Recently faced an issue with a proxy responding in lowercase http, which caused this:
Changing the string to uppercase before checking if it starts with HTTP fixes this issue and allows to use this proxy.
I know that the proxy is at fault here, but seeing as other applications (web browsers, office suite, text editors, etc.) still work behind this proxy, I think it might be a reasonable fix to have...
https://bugs.python.org/issue31704