NAME CURLOPT_SSLVERSION - set preferred TLS/SSL version SYNOPSIS #include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSLVERSION, long version); DESCRIPTION Pass a long as parameter to control which version of SSL/TLS to attempt to use. 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_SSLv2 SSLv2 CURL_SSLVERSION_SSLv3 SSLv3 CURL_SSLVERSION_TLSv1_0 TLSv1.0 (Added in 7.34.0) CURL_SSLVERSION_TLSv1_1 TLSv1.1 (Added in 7.34.0) CURL_SSLVERSION_TLSv1_2 TLSv1.2 (Added in 7.34.0) DEFAULT CURL_SSLVERSION_DEFAULT PROTOCOLS All TLS based protocols: HTTPS, FTPS, IMAPS, POP3, SMTPS etc. 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 */  …
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