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Revert caching a default SSLContext #6767

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This PR reverts the changes from #6667 to the previous behavior. Due to the number of edge cases and concurrency issues we've encountered with this change, we've decided the benefit doesn't currently outweigh the pain to existing infrastructure. We've iterated on a few tries to keep this functionality in place, but are still receiving reports of novel issues with this behavior.

We may be able to revisit this in a later version of Requests but we'll need a much more comprehensive test plan.

cert_reqs = "CERT_REQUIRED"
if verify is False:
cert_reqs = "CERT_NONE"
elif verify is True and should_use_default_ssl_context:
pool_kwargs["ssl_context"] = _preloaded_ssl_context
elif isinstance(verify, str):
if not os.path.isdir(verify):
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This is one piece I left in place from #6667. We were unilaterally considering any verify string to be ca_certs instead of detecting if it was a directory. That seems like a miss from #6655 unless I'm missing something?

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