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diff mupdf-source/thirdparty/curl/docs/cmdline-opts/happy-eyeballs-timeout-ms.d @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/curl/docs/cmdline-opts/happy-eyeballs-timeout-ms.d	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,17 @@
+Long: happy-eyeballs-timeout-ms
+Arg: <milliseconds>
+Help: How long to wait in milliseconds for IPv6 before trying IPv4
+Added: 7.59.0
+---
+Happy eyeballs is an algorithm that attempts to connect to both IPv4 and IPv6
+addresses for dual-stack hosts, preferring IPv6 first for the number of
+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 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.
+
+If this option is used several times, the last one will be used.