62 lines
1.9 KiB
Groff
62 lines
1.9 KiB
Groff
.\" generated by cd2nroff 0.1 from CURLINFO_EARLYDATA_SENT_T.md
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.TH CURLINFO_EARLYDATA_SENT_T 3 "2025-07-07" libcurl
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.SH NAME
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CURLINFO_EARLYDATA_SENT_T \- get the number of bytes sent as TLS early data
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.SH SYNOPSIS
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.nf
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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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.fi
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.SH DESCRIPTION
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Pass a pointer to an \fIcurl_off_t\fP 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 \fBnegative\fP 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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.SH PROTOCOLS
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This functionality affects all TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.
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This option works only with the following TLS backends:
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GnuTLS
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.SH EXAMPLE
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.nf
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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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.fi
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.SH AVAILABILITY
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Added in curl 8.11.0
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.SH RETURN VALUE
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\fIcurl_easy_getinfo(3)\fP 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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\fIlibcurl\-errors(3)\fP.
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.SH SEE ALSO
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.BR curl_easy_getinfo (3),
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.BR curl_easy_setopt (3)
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