2. TLS
2.1 CURLINFO_SSL_VERIFYRESULT has limited support
2.2 DER in keychain
+ 2.3 Unable to use PKCS12 certificate with Secure Transport
2.4 Secure Transport won't import PKCS#12 client certificates without a password
2.5 Client cert handling with Issuer DN differs between backends
2.6 CURL_GLOBAL_SSL
Curl doesn't recognize certificates in DER format in keychain, but it works
with PEM. https://curl.haxx.se/bug/view.cgi?id=1065
+2.3 Unable to use PKCS12 certificate with Secure Transport
+
+ See https://github.com/curl/curl/issues/5403
+
2.4 Secure Transport won't import PKCS#12 client certificates without a password
libcurl calls SecPKCS12Import with the PKCS#12 client certificate, but that