CURLOPT_PROXY_SSLVERSION(3)

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

    CURL_SSLVERSION_MAX_DEFAULT
        The flag defines the maximum supported TLS version as TLSv1.2, or the default value from the SSL library. Only the NSS library currently allows one to get the maximum supported TLS version. (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)

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_PROXY_SSLVERSION, CURL_SSLVERSION_TLSv1_1 |
                   CURL_SSLVERSION_MAX_DEFAULT);
  /* 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),