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CURLOPT_TLSAUTH_USERNAME(3) on macOS

The text e5a162dd1c28, as OS X 10.10.4, OS X 10.10.3, OS X 10.10.2, OS X 10.10.1, OS X 10.10 shipped it.

user name for TLS authentication

CURLOPT_TLSAUTH_USERNAME(3) on macOS now