CURLINFO\_STARTTRANSFER\_TIME\_T(3) Library Functions Manual CURLINFO\_STARTTRANSFER\_TIME\_T(3)

# [NAME](#NAME)

CURLINFO\_STARTTRANSFER\_TIME\_T - time to first byte received

# [SYNOPSIS](#SYNOPSIS)

```
#include <curl/curl.h>
CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_STARTTRANSFER_TIME_T,


                           curl_off_t *timep);
```

# [DESCRIPTION](#DESCRIPTION)

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)*](/man/os/curl/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/os/curl/curl_easy_getinfo.3) man page.

# [PROTOCOLS](#PROTOCOLS)

This functionality affects all supported protocols

# [EXAMPLE](#EXAMPLE)

```
int main(void)
{


  CURL *curl = curl_easy_init();


  if(curl) {


    CURLcode result;


    curl_off_t start;


    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");


    result = curl_easy_perform(curl);


    if(result == CURLE_OK) {


      result = curl_easy_getinfo(curl, CURLINFO_STARTTRANSFER_TIME_T, &start);


      if(result == CURLE_OK) {


        printf("Time: %" CURL_FORMAT_CURL_OFF_T ".%06ld", start / 1000000,


               (long)(start % 1000000));


      }


    }


    /* always cleanup */


    curl_easy_cleanup(curl);


  }
}
```

# [AVAILABILITY](#AVAILABILITY)

Added in curl 7.61.0

# [RETURN VALUE](#RETURN_VALUE)

[*curl\_easy\_getinfo(3)*](/man/os/curl/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)*](/man/os/curl/libcurl-errors.3).

# [SEE ALSO](#SEE_ALSO)

[**CURLINFO\_STARTTRANSFER\_TIME**(3)](/man/os/curl/CURLINFO_STARTTRANSFER_TIME.3), [**CURLOPT\_TIMEOUT**(3)](/man/os/curl/CURLOPT_TIMEOUT.3), [**curl\_easy\_getinfo**(3)](/man/os/curl/curl_easy_getinfo.3), [**curl\_easy\_setopt**(3)](/man/os/curl/curl_easy_setopt.3)

2026-10-31 libcurl

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Document: CURLINFO_STARTTRANSFER_TIME_T(3) from curl 8.23.0-r3 (Chainguard OS)
Source: https://github.com/curl/curl.git