Request ssl certificate information
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_CERTINFO, long certinfo);
Pass a long set to 1 to enable libcurl's certificate chain info gatherer. With this enabled, libcurl (if built with OpenSSL, NSS, GSKit or QsoSSL) will extract lots of information and data about the certificates in the certificate chain used in the SSL connection. This data may then be retrieved after a transfer using curl_easy_getinfo(3) and its option CURLINFO_CERTINFO.
Added in 7.19.1
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.