**************************************************************************
* _ _ ____ _
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* Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
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* This software is licensed as described in the file COPYING, which
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**************************************************************************

CURLINFO_HTTP_VERSION - get the http version used in the connection #include <curl/curl.h> CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_HTTP_VERSION, long *p); Pass a pointer to a long to receive the version used in the last http connection. The returned value will be CURL_HTTP_VERSION_1_0, CURL_HTTP_VERSION_1_1, CURL_HTTP_VERSION_2_0, CURL_HTTP_VERSION_3 or 0 if the version can't be determined. HTTP

CURL *curl = curl_easy_init();
if(curl) {
 CURLcode res;
 curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
 res = curl_easy_perform(curl);
 if(res == CURLE_OK) {
 long http_version;
 curl_easy_getinfo(curl, CURLINFO_HTTP_VERSION, &http_version);
 }
 curl_easy_cleanup(curl);
}

Added in 7.50.0 Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not. CURLINFO_RESPONSE_CODE "(3), " curl_easy_getinfo "(3), " curl_easy_setopt "(3), "