CURLOPT_TCP_FASTOPEN(3)    curl_easy_setopt options    CURLOPT_TCP_FASTOPEN(3)

NAME
       CURLOPT_TCP_FASTOPEN - enable 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 1 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
       TODO

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.

libcurl 7.54.0                  April 03, 2016         CURLOPT_TCP_FASTOPEN(3)