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- 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.
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