CURLOPT_TCP_FASTOPEN - TCP Fast Open
#include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TCP_FASTOPEN, long enable);
CURLOPT_TCP_FASTOPEN(3) curl_easy_setopt options CURLOPT_TCP_FASTOPEN(3)
NAME
CURLOPT_TCP_FASTOPEN - TCP Fast Open
SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TCP_FASTOPEN, long enable);
DESCRIPTION
Pass a long as parameter set to 1L to enable or 0 to disable.
TCP Fast Open (RFC7413) is a mechanism that allows data to be carried
in the SYN and SYN-ACK packets and consumed by the receiving end during
the initial connection handshake, saving up to one full round-trip time
(RTT).
DEFAULT
0
PROTOCOLS
All
EXAMPLE
CURL *curl = curl_easy_init();
if(curl) {
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
curl_easy_setopt(curl, CURLOPT_TCP_FASTOPEN, 1L);
curl_easy_perform(curl);
}
AVAILABILITY
Added in 7.49.0. This option is currently only supported on Linux and
OS X El Capitan.
RETURN VALUE
Returns CURLE_OK if fast open is supported by the operating system,
otherwise returns CURLE_NOT_BUILT_IN.
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
+---------------+------------------+
|ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+---------------+------------------+
|Availability | web/curl |
+---------------+------------------+
|Stability | Uncommitted |
+---------------+------------------+
SEE ALSO
CURLOPT_SSL_FALSESTART(3),
NOTES
Source code for open source software components in Oracle Solaris can
be found at https://www.oracle.com/downloads/opensource/solaris-source-
code-downloads.html.
This software was built from source available at
https://github.com/oracle/solaris-userland. The original community
source was downloaded from https://curl.se/down-
load/curl-7.83.1.tar.bz2.
Further information about this software can be found on the open source
community website at http://curl.haxx.se/.
libcurl 7.83.1 November 26, 2021 CURLOPT_TCP_FASTOPEN(3)