47 lines
1.4 KiB
Groff
47 lines
1.4 KiB
Groff
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.\" generated by cd2nroff 0.1 from CURLOPT_TCP_FASTOPEN.md
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.TH CURLOPT_TCP_FASTOPEN 3 "2025-07-07" libcurl
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.SH NAME
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CURLOPT_TCP_FASTOPEN \- TCP Fast Open
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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_setopt(CURL *handle, CURLOPT_TCP_FASTOPEN, long enable);
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.fi
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.SH DESCRIPTION
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Pass a long as parameter set to 1L to enable or 0 to disable.
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TCP Fast Open (RFC 7413) is a mechanism that allows data to be carried in the
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SYN and SYN\-ACK packets and consumed by the receiving end during the initial
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connection handshake, saving up to one full round\-trip time (RTT).
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Beware: the TLS session cache does not work when TCP Fast Open is enabled. TCP
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Fast Open is also known to be problematic on or across certain networks.
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.SH DEFAULT
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0
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.SH PROTOCOLS
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This functionality affects tcp only
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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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curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
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curl_easy_setopt(curl, CURLOPT_TCP_FASTOPEN, 1L);
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curl_easy_perform(curl);
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}
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}
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.fi
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.SH NOTES
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This option is only supported on Linux and macOS 10.11 or later.
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.SH AVAILABILITY
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Added in curl 7.49.0
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.SH RETURN VALUE
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\fIcurl_easy_setopt(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 CURLOPT_SSL_FALSESTART (3)
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