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2427d94c6d
- 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
18 lines
841 B
D
18 lines
841 B
D
Long: happy-eyeballs-timeout-ms
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Arg: <milliseconds>
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Help: How long to wait in milliseconds for IPv6 before trying IPv4
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Added: 7.59.0
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---
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Happy eyeballs is an algorithm that attempts to connect to both IPv4 and IPv6
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addresses for dual-stack hosts, preferring IPv6 first for the number of
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milliseconds. If the IPv6 address cannot be connected to within that time then
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a connection attempt is made to the IPv4 address in parallel. The first
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connection to be established is the one that is used.
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The range of suggested useful values is limited. Happy Eyeballs RFC 6555 says
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"It is RECOMMENDED that connection attempts be paced 150-250 ms apart to
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balance human factors against network load." libcurl currently defaults to
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200 ms. Firefox and Chrome currently default to 300 ms.
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If this option is used several times, the last one will be used.
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