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

NAME
       CURLOPT_PROXY_SSLCERT - set SSL proxy client certificate

SYNOPSIS
       #include <curl/curl.h>

       CURLcode  curl_easy_setopt(CURL  *handle,  CURLOPT_PROXY_SSLCERT,  char
       *cert);

DESCRIPTION
       This option is for connecting to a HTTPS proxy, not a HTTPS server.

       Pass a pointer to a zero terminated string  as  parameter.  The  string
       should  be  the file name of your client certificate used to connect to
       the HTTPS proxy.  The default format is "P12" on Secure  Transport  and
       "PEM"  on other engines, and can be changed with CURLOPT_PROXY_SSLCERT-
       TYPE(3).

       With NSS or Secure Transport, this can also be the nickname of the cer-
       tificate  you  wish to authenticate with as it is named in the security
       database. If you want to use a file from the current directory,  please
       precede  it  with "./" prefix, in order to avoid confusion with a nick-
       name.

       When using a client certificate, you most likely also need to provide a
       private key with CURLOPT_PROXY_SSLKEY(3).

       The  application  does not have to keep the string around after setting
       this option.

DEFAULT
       NULL

PROTOCOLS
       Used with HTTPS proxy

EXAMPLE
       TODO

AVAILABILITY
       Added in 7.52.0

RETURN VALUE
       Returns CURLE_OK  if  TLS  enabled,  CURLE_UNKNOWN_OPTION  if  not,  or
       CURLE_OUT_OF_MEMORY if there was insufficient heap space.

SEE ALSO
       CURLOPT_PROXY_SSLCERTTYPE(3),       CURLOPT_PROXY_SSLKEY(3),       CUR-
       LOPT_SSLCERT(3),

libcurl 7.54.0                 December 21, 2016      CURLOPT_PROXY_SSLCERT(3)