Pass a string which contains a
client certificate. The format must be "P12" on Secure Transport or
Schannel. The format must be "P12" or "PEM" on OpenSSL. The format must be
"DER" or "PEM" on mbedTLS. The format must be specified with
#CURLOPT_SSLCERTTYPE
.
This option is an alternative to #CURLOPT_SSLCERT
which instead
expects a file name as input.