mojave man page for curlopt_use_ssl

CURLOPT_USE_SSL(3)					     curl_easy_setopt options						CURLOPT_USE_SSL(3)

NAME
       CURLOPT_USE_SSL - request using SSL / TLS for the transfer

SYNOPSIS
       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_USE_SSL, long level);

DESCRIPTION
       Pass a long using one of the values from below, to make libcurl use your desired level of SSL for the transfer.

       These are all protocols that start out plain text and get "upgraded" to SSL using the STARTTLS command.

       This is for enabling SSL/TLS when you use FTP, SMTP, POP3, IMAP etc.

       CURLUSESSL_NONE
	      Don't attempt to use SSL.

       CURLUSESSL_TRY
	      Try using SSL, proceed as normal otherwise.

       CURLUSESSL_CONTROL
	      Require SSL for the control connection or fail with CURLE_USE_SSL_FAILED.

       CURLUSESSL_ALL
	      Require SSL for all communication or fail with CURLE_USE_SSL_FAILED.

DEFAULT
       CURLUSESSL_NONE

PROTOCOLS
       FTP, SMTP, POP3, IMAP

EXAMPLE
       CURL *curl = curl_easy_init();
       if(curl) {
	 curl_easy_setopt(curl, CURLOPT_URL, "ftp://example.com/dir/file.ext");

	 /* require use of SSL for this, or fail */
	 curl_easy_setopt(curl, CURLOPT_USE_SSL, CURLUSESSL_ALL);

	 /* Perform the request */
	 curl_easy_perform(curl);
       }

AVAILABILITY
       Added in 7.11.0. This option was known as CURLOPT_FTP_SSL up to 7.16.4, and the constants were known as CURLFTPSSL_*

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

SEE ALSO
       CURLOPT_SSLVERSION(3), CURLOPT_SSL_OPTIONS(3),

libcurl 7.54.0							 February 03, 2016						CURLOPT_USE_SSL(3)