CURLOPT_PROXY_TLS13_CIPHERS − ciphers suites for proxy TLS 1.3
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_TLS13_CIPHERS, char *list);
Pass a char *, pointing to a null-terminated string holding the list of cipher suites to use for the TLS 1.3 connection to a proxy. The list must be syntactically correct, it consists of one or more cipher suite strings separated by colons.
You’ll find more details about cipher lists on this URL:
This option is currently used only when curl is built to use OpenSSL 1.1.1 or later. If you are using a different SSL backend you can try setting TLS 1.3 cipher suites by using the CURLOPT_PROXY_SSL_CIPHER_LIST option.
The application does not have to keep the string around after setting this option.
NULL, use internal default
All TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.
CURL *curl =
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
ret = curl_easy_perform(curl);
Added in 7.61.0. Available when built with OpenSSL >= 1.1.1.
Returns CURLE_OK if supported, CURLE_NOT_BUILT_IN otherwise.
CURLOPT_PROXY_SSL_CIPHER_LIST(3), CURLOPT_PROXY_SSLVERSION(3), CURLOPT_SSL_CIPHER_LIST(3), CURLOPT_TLS13_CIPHERS(3), CURLOPT_SSLVERSION(3),