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* Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
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CURLINFO_PRETRANSFER_TIME - get the time until the file transfer start #include <curl/curl.h> CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_PRETRANSFER_TIME, double *timep); Pass a pointer to a double to receive the time, in seconds, it took from the start until the file transfer is just about to begin. This includes all pre-transfer commands and negotiations that are specific to the particular protocol(s) involved. It does not involve the sending of the protocol- specific request that triggers a transfer. 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 pretransfer;
 curl_easy_setopt(curl, CURLOPT_URL, url);
 res = curl_easy_perform(curl);
 if(CURLE_OK == res) {
 res = curl_easy_getinfo(curl, CURLINFO_PRETRANSFER_TIME, &pretransfer);
 if(CURLE_OK == res) {
 printf("Time: %.1f", pretransfer);
 }
 }
 /* always cleanup */
 curl_easy_cleanup(curl);
}

Added in 7.4.1 Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not. curl_easy_getinfo "(3), " curl_easy_setopt "(3), " CURLINFO_PRETRANSFER_TIME_T "(3)"