Ubuntu Manpage: CURLOPT_PROXY_SSLVERSION - preferred HTTPS proxy TLS version

NAME

       CURLOPT_PROXY_SSLVERSION - preferred HTTPS proxy TLS 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.