Unknown option: "-3" Unix manual page for CURLOPT_CERTINFO. (host=minya system=Darwin)
CURLOPT_CERTINFO(3)        curl_easy_setopt options        CURLOPT_CERTINFO(3)

NAME
       CURLOPT_CERTINFO - request SSL certificate information

SYNOPSIS
       #include <curl/curl.h>

       CURLcode  curl_easy_setopt(CURL  *handle,  CURLOPT_CERTINFO, long cert-
       info);

DESCRIPTION
       Pass a long set to 1 to enable libcurl's certificate chain  info  gath-
       erer.  With  this enabled, libcurl 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(3).

DEFAULT
       0

PROTOCOLS
       All TLS-based

EXAMPLE
       TODO

AVAILABILITY
       This option is supported by the OpenSSL, GnuTLS, NSS  and  GSKit  back-
       ends.

RETURN VALUE
       Returns  CURLE_OK  if the option is supported, and CURLE_UNKNOWN_OPTION
       if not.

SEE ALSO
       CURLOPT_CAINFO(3), CURLOPT_SSL_VERIFYPEER(3),

libcurl 7.54.0                 February 03, 2016           CURLOPT_CERTINFO(3)