CURLINFO_E...DATA_SENT_T(3) Library Functions ManualCURLINFO_E...DATA_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 session
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 2026-07-12 CURLINFO_E...DATA_SENT_T(3)
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