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Annotation of embedaddon/curl/docs/cmdline-opts/happy-eyeballs-timeout-ms.d, revision 1.1

1.1     ! misho       1: Long: happy-eyeballs-timeout-ms
        !             2: Arg: <milliseconds>
        !             3: Help: How long to wait in milliseconds for IPv6 before trying IPv4
        !             4: Added: 7.59.0
        !             5: ---
        !             6: Happy eyeballs is an algorithm that attempts to connect to both IPv4 and IPv6
        !             7: addresses for dual-stack hosts, preferring IPv6 first for the number of
        !             8: milliseconds. If the IPv6 address cannot be connected to within that time then
        !             9: a connection attempt is made to the IPv4 address in parallel. The first
        !            10: connection to be established is the one that is used.
        !            11: 
        !            12: The range of suggested useful values is limited. Happy Eyeballs RFC 6555 says
        !            13: "It is RECOMMENDED that connection attempts be paced 150-250 ms apart to
        !            14: balance human factors against network load." libcurl currently defaults to
        !            15: 200 ms. Firefox and Chrome currently default to 300 ms.
        !            16: 
        !            17: If this option is used several times, the last one will be used.