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CURLINFO_...ATA_SENT_T(3)  Library Functions Manual  CURLINFO_...ATA_SENT_T(3)

NAME
       CURLINFO_EARLYDATA_SENT_T  -  get the number of bytes sent as TLS early
       data

SYNOPSIS
       #include	<curl/curl.h>

       CURLcode	curl_easy_getinfo(CURL *handle,	CURLINFO_EARLYDATA_SENT_T,
				  curl_off_t *amount);

DESCRIPTION
       Pass a pointer to an curl_off_t to receive the total  amount  of	 bytes
       that  were  sent	to the server as TLSv1.3 early data. When no TLS early
       data is used, this reports 0.

       TLS early data is only attempted	when CURLSSLOPT_EARLYDATA is  set  for
       the  transfer.  In addition, it is only used by libcurl when a TLS ses-
       sion exists that	announces support.

       The amount is negative when the sent data was rejected by  the  server.
       TLS allows a server that	announces support for early data to reject any
       attempt to use it at its	own discretion.	When for example 127 bytes had
       been sent, but were rejected, it	reports	-127 as	the amount "sent".

PROTOCOLS
       This functionality affects all TLS based	protocols: HTTPS, FTPS,	IMAPS,
       POP3S, SMTPS etc.

       This option works only with the following TLS backends: GnuTLS

EXAMPLE
       int main(void)
       {
	 CURL *curl = curl_easy_init();
	 if(curl) {
	   CURLcode res;
	   curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");

	   /* Perform the request */
	   res = curl_easy_perform(curl);

	   if(!res) {
	     curl_off_t	amount;
	     res = curl_easy_getinfo(curl, CURLINFO_EARLYDATA_SENT_T, &amount);
	     if(!res) {
	       printf("TLS earlydata: %" CURL_FORMAT_CURL_OFF_T	" bytes\n", amount);
	     }
	   }
	 }
       }

AVAILABILITY
       Added in	curl 8.11.0

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
       curl_easy_getinfo(3), curl_easy_setopt(3)

libcurl				  2025-06-03	     CURLINFO_...ATA_SENT_T(3)

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