CURLINFO_STARTTRANSFER_TIME_T - get the time until the first byte is received

Added in curl 7.61.0

Pass a pointer to a curl_off_t to receive the time, in microseconds, it took from the start until the first byte is received by libcurl. This includes CURLINFO_PRETRANSFER_TIME_T(3) and also the time the server needs to calculate the result. 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.

int main(void) { CURL *curl = curl_easy_init(); if(curl) { CURLcode res; curl_off_t start; curl_easy_setopt(curl, CURLOPT_URL, "https://example.com"); res = curl_easy_perform(curl); if(CURLE_OK == res) { res = curl_easy_getinfo(curl, CURLINFO_STARTTRANSFER_TIME_T, &start); if(CURLE_OK == res) { printf("Time: %" CURL_FORMAT_CURL_OFF_T ".%06ld", start / 1000000, (long)(start % 1000000)); } } /* always cleanup */ curl_easy_cleanup(curl); } }

CURLINFO_STARTTRANSFER_TIME_T - get the time until the first byte is received

This functionality affects all supported protocols

curl_easy_getinfo(3) returns a CURLcode indicating success or error. CURLE_OK (0) means everything was OK, non-zero means an error occurred, see libcurl-errors(3).

CURLINFO_STARTTRANSFER_TIME(3), CURLOPT_TIMEOUT(3), curl_easy_getinfo(3), curl_easy_setopt(3) libcurl 2025-06-16 CURLINFO_STARTTRANSFER_TIME_T(3)

#include <curl/curl.h> CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_STARTTRANSFER_TIME_T, curl_off_t *timep);