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OSX 10.14 Mojave - man page for curlopt_cainfo (mojave section 3)

CURLOPT_CAINFO(3)					     curl_easy_setopt options						 CURLOPT_CAINFO(3)

NAME
CURLOPT_CAINFO - path to Certificate Authority (CA) bundle
SYNOPSIS
#include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_CAINFO, char *path);
DESCRIPTION
Pass a char * to a zero terminated string naming a file holding one or more certificates to verify the peer with. If CURLOPT_SSL_VERIFYPEER(3) is zero and you avoid verifying the server's certificate, CURLOPT_CAINFO(3) need not even indicate an accessi- ble file. This option is by default set to the system path where libcurl's cacert bundle is assumed to be stored, as established at build time. If curl is built against the NSS SSL library, the NSS PEM PKCS#11 module (libnsspem.so) needs to be available for this option to work prop- erly. (iOS and macOS only) If curl is built against Secure Transport, then this option is supported for backward compatibility with other SSL engines, but it should not be set. If the option is not set, then curl will use the certificates in the system and user Keychain to verify the peer, which is the preferred method of verifying the peer's certificate chain. The application does not have to keep the string around after setting this option.
DEFAULT
Built-in system specific
PROTOCOLS
All TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.
EXAMPLE
TODO
AVAILABILITY
For SSL engines that don't support certificate files the CURLOPT_CAINFO option is ignored. Refer to https://curl.haxx.se/docs/ssl-com- pared.html
RETURN VALUE
Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not, or CURLE_OUT_OF_MEMORY if there was insufficient heap space.
SEE ALSO
CURLOPT_CAPATH(3), CURLOPT_SSL_VERIFYPEER(3), CURLOPT_SSL_VERIFYHOST(3), libcurl 7.54.0 December 21, 2016 CURLOPT_CAINFO(3)