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e3fe020089
Remove the PROTOCOLS section from the source files completely and instead generate them based on the header data in the curldown files. It also generates TLS backend information for options marked for TLS as protocol. Closes #13175
62 lines
1.3 KiB
Markdown
62 lines
1.3 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: CURLOPT_TCP_FASTOPEN
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Section: 3
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Source: libcurl
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See-also:
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- CURLOPT_SSL_FALSESTART (3)
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Protocol:
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- All
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---
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# NAME
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CURLOPT_TCP_FASTOPEN - TCP Fast Open
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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_setopt(CURL *handle, CURLOPT_TCP_FASTOPEN, long enable);
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~~~
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# 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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# DEFAULT
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0
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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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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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~~~
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# AVAILABILITY
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Added in 7.49.0. This option is currently only supported on Linux and macOS
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10.11 or later.
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# RETURN VALUE
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Returns CURLE_OK if fast open is supported by the operating system, otherwise
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returns CURLE_NOT_BUILT_IN.
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