Provided by: libcurl4-doc_7.68.0-1ubuntu2.25_all bug

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),