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CURLOPT_PROXY_SSLVERSION

Section: curl_easy_setopt options (3)
Updated: August 12, 2017
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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.