CURLINFO_STARTTRANSFER_TIME(3) Introduction to Library Functions

NAME

CURLINFO_STARTTRANSFER_TIME - time to first byte received

SYNOPSIS

#include <curl/curl.h>

CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_STARTTRANSFER_TIME,
double *timep);

DESCRIPTION

Pass a pointer to a double to receive the time, in seconds, it took
from the start until the first byte is received by libcurl. This
includes CURLINFO_PRETRANSFER_TIME(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.

PROTOCOLS

This functionality affects all supported protocols

EXAMPLE

int main(void)
{
CURL *curl = curl_easy_init();
if(curl) {
CURLcode result;
double start;
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
result = curl_easy_perform(curl);
if(CURLE_OK == result) {
result = curl_easy_getinfo(curl, CURLINFO_STARTTRANSFER_TIME, &start);
if(CURLE_OK == result) {
printf("Time: %.1f", start);
}
}
/* always cleanup */
curl_easy_cleanup(curl);
}
}

AVAILABILITY

Added in curl 7.9.2

RETURN VALUE

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).

SEE ALSO

CURLINFO_STARTTRANSFER_TIME_T(3), CURLOPT_TIMEOUT(3),
curl_easy_getinfo(3), curl_easy_setopt(3)

libcurl 2026-01-08 CURLINFO_STARTTRANSFER_TIME(3)