Skip site navigation (1)Skip section navigation (2)

FreeBSD Manual Pages

  
 
  

home | help
CURLOPT_HAPPY_EYEBALLS_TIMEcurl_easy_setopCURLOPT_HAPPY_EYEBALLS_TIMEOUT_MS(3)

NAME
       CURLOPT_HAPPY_EYEBALLS_TIMEOUT_MS  - head start for ipv6	for happy eye-
       balls

SYNOPSIS
       #include	<curl/curl.h>

       CURLcode	 curl_easy_setopt(CURL	*handle,  CURLOPT_HAPPY_EYEBALLS_TIME-
       OUT_MS, long timeout);

DESCRIPTION
       Happy  eyeballs	is  an algorithm that attempts to connect to both IPv4
       and IPv6	addresses for dual-stack  hosts,  preferring  IPv6  first  for
       timeout milliseconds. If	the IPv6 address cannot	be connected to	within
       that time then a	connection attempt is made to the IPv4 address in par-
       allel. The first	connection to be established is	the one	that is	used.

       The range of suggested useful values for	timeout	is limited. Happy Eye-
       balls RFC 6555 says "It is  RECOMMENDED	that  connection  attempts  be
       paced  150-250 ms apart to balance human	factors	against	network	load."
       libcurl currently defaults to 200 ms. Firefox and Chrome	currently  de-
       fault to	300 ms.

DEFAULT
       CURL_HET_DEFAULT	(currently defined as 200L)

EXAMPLE
       CURL *curl = curl_easy_init();
       if(curl)	{
	 curl_easy_setopt(curl,	CURLOPT_URL, "https://example.com");
	 curl_easy_setopt(curl,	CURLOPT_HAPPY_EYEBALLS_TIMEOUT_MS, 300L);

	 curl_easy_perform(curl);

	 /* always cleanup */
	 curl_easy_cleanup(curl);
       }

AVAILABILITY
       Added in	7.59.0

RETURN VALUE
       Returns CURLE_OK

libcurl	7.72.0			March 23, CURLOPT_HAPPY_EYEBALLS_TIMEOUT_MS(3)

NAME | SYNOPSIS | DESCRIPTION | DEFAULT | EXAMPLE | AVAILABILITY | RETURN VALUE

Want to link to this manual page? Use this URL:
<https://www.freebsd.org/cgi/man.cgi?query=CURLOPT_HAPPY_EYEBALLS_TIMEOUT_MS&sektion=3&manpath=FreeBSD+12.1-RELEASE+and+Ports>

home | help