From 2427d94c6d088b13ad971bb3cee5b7de42b37d24 Mon Sep 17 00:00:00 2001 From: Anders Bakken Date: Tue, 30 Jan 2018 16:33:51 -0800 Subject: url: Add option CURLOPT_HAPPY_EYEBALLS_TIMEOUT - Add new option CURLOPT_HAPPY_EYEBALLS_TIMEOUT to set libcurl's happy eyeball timeout value. - Add new optval macro CURL_HET_DEFAULT to represent the default happy eyeballs timeout value (currently 200 ms). - Add new tool option --happy-eyeballs-timeout-ms to expose CURLOPT_HAPPY_EYEBALLS_TIMEOUT. The -ms suffix is used because the other -timeout options in the tool expect seconds not milliseconds. Closes https://github.com/curl/curl/pull/2260 --- docs/libcurl/opts/CURLOPT_HAPPY_EYEBALLS_TIMEOUT.3 | 59 ++++++++++++++++++++++ 1 file changed, 59 insertions(+) create mode 100644 docs/libcurl/opts/CURLOPT_HAPPY_EYEBALLS_TIMEOUT.3 (limited to 'docs/libcurl/opts/CURLOPT_HAPPY_EYEBALLS_TIMEOUT.3') diff --git a/docs/libcurl/opts/CURLOPT_HAPPY_EYEBALLS_TIMEOUT.3 b/docs/libcurl/opts/CURLOPT_HAPPY_EYEBALLS_TIMEOUT.3 new file mode 100644 index 000000000..d4fa1505b --- /dev/null +++ b/docs/libcurl/opts/CURLOPT_HAPPY_EYEBALLS_TIMEOUT.3 @@ -0,0 +1,59 @@ +.\" ************************************************************************** +.\" * _ _ ____ _ +.\" * Project ___| | | | _ \| | +.\" * / __| | | | |_) | | +.\" * | (__| |_| | _ <| |___ +.\" * \___|\___/|_| \_\_____| +.\" * +.\" * Copyright (C) 1998 - 2015, Daniel Stenberg, , et al. +.\" * +.\" * This software is licensed as described in the file COPYING, which +.\" * you should have received as part of this distribution. The terms +.\" * are also available at https://curl.haxx.se/docs/copyright.html. +.\" * +.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell +.\" * copies of the Software, and permit persons to whom the Software is +.\" * furnished to do so, under the terms of the COPYING file. +.\" * +.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY +.\" * KIND, either express or implied. +.\" * +.\" ************************************************************************** +.\" +.TH CURLOPT_HAPPY_EYEBALLS_TIMEOUT 3 "1 Feb 2018" "libcurl 7.59.0" "curl_easy_setopt options" +.SH NAME +CURLOPT_HAPPY_EYEBALLS_TIMEOUT \- head start for ipv6 for happy eyeballs +.SH SYNOPSIS +#include + +CURLcode curl_easy_setopt(CURL *handle, CURLOPT_HAPPY_EYEBALLS_TIMEOUT, long timeout); +.SH DESCRIPTION +Happy eyeballs is an algorithm that attempts to connect to both IPv4 and IPv6 +addresses for dual-stack hosts, preferring IPv6 first for \fItimeout\fP +milliseconds. If the IPv6 address cannot be connected to within that time then +a connection attempt is made to the IPv4 address in parallel. The first +connection to be established is the one that is used. + +The range of suggested useful values for \fItimeout\fP is limited. Happy +Eyeballs 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 default to 300 ms. +.SH DEFAULT +CURL_HET_DEFAULT (currently defined as 200L) +.SH EXAMPLE +.nf +CURL *curl = curl_easy_init(); +if(curl) { + curl_easy_setopt(curl, CURLOPT_URL, "https://example.com"); + curl_easy_setopt(curl, CURLOPT_HAPPY_EYEBALLS_TIMEOUT, 300L); + + curl_easy_perform(curl); + + /* always cleanup */ + curl_easy_cleanup(curl); +} +.fi +.SH AVAILABILITY +Added in 7.59.0 +.SH RETURN VALUE +Returns CURLE_OK -- cgit v1.2.3