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e694c8284a
Expand a little. - mention the type name of the return code - avoid stating which exact return codes that might be returned, as that varies over time, builds and conditions - avoid stating some always return OK - refer to the manpage documenting all the return codes Closes #15900
78 lines
1.8 KiB
Markdown
78 lines
1.8 KiB
Markdown
---
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c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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SPDX-License-Identifier: curl
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Title: CURLINFO_EARLYDATA_SENT_T
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Section: 3
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Source: libcurl
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See-also:
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- curl_easy_getinfo (3)
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- curl_easy_setopt (3)
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Protocol:
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- TLS
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TLS-backend:
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- GnuTLS
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Added-in: 8.11.0
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---
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# NAME
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CURLINFO_EARLYDATA_SENT_T - get the number of bytes sent as TLS early data
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# SYNOPSIS
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~~~c
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#include <curl/curl.h>
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CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_EARLYDATA_SENT_T,
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curl_off_t *amount);
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~~~
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# DESCRIPTION
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Pass a pointer to an *curl_off_t* to receive the total amount of bytes that
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were sent to the server as TLSv1.3 early data. When no TLS early
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data is used, this reports 0.
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TLS early data is only attempted when CURLSSLOPT_EARLYDATA is set for the
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transfer. In addition, it is only used by libcurl when a TLS session exists
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that announces support.
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The amount is **negative** when the sent data was rejected
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by the server. TLS allows a server that announces support for early data to
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reject any attempt to use it at its own discretion. When for example 127
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bytes had been sent, but were rejected, it reports -127 as the amount "sent".
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# %PROTOCOLS%
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# EXAMPLE
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~~~c
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int main(void)
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{
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CURL *curl = curl_easy_init();
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if(curl) {
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CURLcode res;
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curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
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/* Perform the request */
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res = curl_easy_perform(curl);
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if(!res) {
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curl_off_t amount;
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res = curl_easy_getinfo(curl, CURLINFO_EARLYDATA_SENT_T, &amount);
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if(!res) {
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printf("TLS earlydata: %" CURL_FORMAT_CURL_OFF_T " bytes\n", amount);
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}
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}
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}
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}
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~~~
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# %AVAILABILITY%
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# RETURN VALUE
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curl_easy_getinfo(3) returns a CURLcode indicating success or error.
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CURLE_OK (0) means everything was OK, non-zero means an error occurred, see
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libcurl-errors(3).
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