CURLOPT_PROXY_SSLVERSION(3)                           curl_easy_setopt options

NAME
       CURLOPT_PROXY_SSLVERSION - set preferred proxy TLS/SSL version

SYNOPSIS
       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_SSLVERSION, long
       version);

DESCRIPTION
       Pass a long as parameter to control which version of SSL/TLS to attempt
       to use when connecting to an HTTPS proxy.

       Use one of the available defines for this purpose. The available
       options are:

              CURL_SSLVERSION_DEFAULT
                     The default action. This will attempt to figure out the
                     remote SSL protocol version.

              CURL_SSLVERSION_TLSv1
                     TLSv1.x

              CURL_SSLVERSION_TLSv1_0
                     TLSv1.0

              CURL_SSLVERSION_TLSv1_1
                     TLSv1.1

              CURL_SSLVERSION_TLSv1_2
                     TLSv1.2

              CURL_SSLVERSION_TLSv1_3
                     TLSv1.3
       The maximum TLS version can be set by using one of the
       CURL_SSLVERSION_MAX_ macros below. It is also possible to OR one of the
       CURL_SSLVERSION_ macros with one of the CURL_SSLVERSION_MAX_ macros.
       The MAX macros are not supported for WolfSSL.

              CURL_SSLVERSION_MAX_DEFAULT
                     The flag defines the maximum supported TLS version as
                     TLSv1.2, or the default value from the SSL library.
                     (Added in 7.54.0)

              CURL_SSLVERSION_MAX_TLSv1_0
                     The flag defines maximum supported TLS version as
                     TLSv1.0.  (Added in 7.54.0)

              CURL_SSLVERSION_MAX_TLSv1_1
                     The flag defines maximum supported TLS version as
                     TLSv1.1.  (Added in 7.54.0)

              CURL_SSLVERSION_MAX_TLSv1_2
                     The flag defines maximum supported TLS version as
                     TLSv1.2.  (Added in 7.54.0)

              CURL_SSLVERSION_MAX_TLSv1_3
                     The flag defines maximum supported TLS version as
                     TLSv1.3.  (Added in 7.54.0)

       In versions of curl prior to 7.54 the CURL_SSLVERSION_TLS options were
       documented to allow only the specified TLS version, but behavior was
       inconsistent depending on the TLS library.

DEFAULT
       CURL_SSLVERSION_DEFAULT

PROTOCOLS
       All

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

         /* ask libcurl to use TLS version 1.0 or later */
         curl_easy_setopt(curl, CURLOPT_SSLVERSION, CURL_SSLVERSION_TLSv1);

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

AVAILABILITY
       Added in 7.52.0

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

SEE ALSO
       CURLOPT_USE_SSL(3), CURLOPT_HTTP_VERSION(3),  CURLOPT_IPRESOLVE(3)
       CURLOPT_SSLVERSION(3),

libcurl 7.77.0                 November 4, 2020    CURLOPT_PROXY_SSLVERSION(3)