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CURLINFO_PROTOCOL - get the protocol used in the connection #include <curl/curl.h> CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_PROTOCOL, long *p); Pass a pointer to a long to receive the version used in the last http connection. The returned value will be exactly one of the CURLPROTO_* values:

CURLPROTO_DICT, CURLPROTO_FILE, CURLPROTO_FTP, CURLPROTO_FTPS,
CURLPROTO_GOPHER, CURLPROTO_HTTP, CURLPROTO_HTTPS, CURLPROTO_IMAP,
CURLPROTO_IMAPS, CURLPROTO_LDAP, CURLPROTO_LDAPS, CURLPROTO_POP3,
CURLPROTO_POP3S, CURLPROTO_RTMP, CURLPROTO_RTMPE, CURLPROTO_RTMPS,
CURLPROTO_RTMPT, CURLPROTO_RTMPTE, CURLPROTO_RTMPTS, CURLPROTO_RTSP,
CURLPROTO_SCP, CURLPROTO_SFTP, CURLPROTO_SMB, CURLPROTO_SMBS, CURLPROTO_SMTP,
CURLPROTO_SMTPS, CURLPROTO_TELNET, CURLPROTO_TFTP
 PROTOCOLS
All
 EXAMPLE
CURL *curl = curl_easy_init();
if(curl) {
 CURLcode res;
 curl_easy_setopt(curl, CURLOPT_URL, "http://example.com");
 res = curl_easy_perform(curl);
 if(res == CURLE_OK) {
 long protocol;
 curl_easy_getinfo(curl, CURLINFO_PROTOCOL, &protocol);
 }
 curl_easy_cleanup(curl);
}

 AVAILABILITY
Added in 7.52.0
 RETURN VALUE
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
 "SEE ALSO"
 CURLINFO_RESPONSE_CODE "(3), "  curl_easy_getinfo "(3), " curl_easy_setopt "(3), "