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curlon the Mac returns a certificate verification error even when the
--cacertoption is used.
Apple’s integration of
curl with their keychain technology disables the
See http://curl.haxx.se/mail/archive-2013-10/0036.html for more information.
You can use another tool, such as
wget, to test certificates. Alternately, you
can add the certificate for the signing certificate authority MacOS system
keychain, using a procedure similar to the one detailed at the
Apple knowledge base. Be sure to add the
signing CA’s certificate and not the server’s certificate.