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Updated: Thursday, June 13, 2019
 
 

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

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 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, "http://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      |
       +---------------+------------------+
NOTES
       This     software     was    built    from    source    available    at
       https://github.com/oracle/solaris-userland.   The  original   community
       source    was    downloaded    from    https://github.com/curl/curl/ar-
       chive/curl-7_64_0.zip

       Further information about this software can be found on the open source
       community website at http://curl.haxx.se/.



libcurl 7.49.0                    16 Feb 2016          CURLOPT_TCP_FASTOPEN(3)