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)