CURLOPT_PROXY_SSLVERSION - preferred HTTPS proxy TLS version
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_SSLVERSION,
long version);
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.
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);
}
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
CURLOPT_USE_SSL(3), CURLOPT_HTTP_VERSION(3),
CURLOPT_IPRESOLVE(3) CURLOPT_SSLVERSION(3),