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The root cause is that Pinecone Local does not support TLS/SSL at all. Verified workaround, confirmed by the reporter: pass the host explicitly with an http scheme instead of relying on the scheme-less host from describe_index, pointing at your local Pinecone instance on port 5081. Maintainer mcaddy gave this answer on the thread. Note that a separate community PR proposed a code fix for the scheme handling, but the http host workaround is confirmed working.
Source: https://github.com/pinecone-io/python-sdk/issues/465