CURLOPT_PROXY_SSLVERSION man page

CURLOPT_PROXY_SSLVERSION ā€” 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),

Referenced By

curl_easy_setopt(3), CURLOPT_PROXY_SSL_CIPHER_LIST(3), CURLOPT_PROXY_SSL_OPTIONS(3).

August 12, 2017 libcurl 7.57.0 curl_easy_setopt options