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* Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
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CURLINFO_APPCONNECT_TIME - get the time until the SSL/SSH handshake is completed #include <curl/curl.h> CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_APPCONNECT_TIME, double *timep); Pass a pointer to a double to receive the time, in seconds, it took from the start until the SSL/SSH connect/handshake to the remote host was completed. This time is most often close to the CURLINFO_PRETRANSFER_TIME(3) time, except for cases such as HTTP pipelining where the pretransfer time can be delayed due to waits in line for the pipeline and more. When a redirect is followed, the time from each request is added together. See also the TIMES overview in the curl_easy_getinfo(3) man page. All

curl = curl_easy_init();
if(curl) {
 double connect;
 curl_easy_setopt(curl, CURLOPT_URL, url);
 res = curl_easy_perform(curl);
 if(CURLE_OK == res) {
 res = curl_easy_getinfo(curl, CURLINFO_APPCONNECT_TIME, &connect);
 if(CURLE_OK == res) {
 printf("Time: %.1f", connect);
 }
 }
 /* always cleanup */
 curl_easy_cleanup(curl);
}

Added in 7.19.0 Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not. curl_easy_getinfo "(3), " curl_easy_setopt "(3), " CURLINFO_APPCONNECT_TIME_T "(3)"