mirror of
https://github.com/curl/curl.git
synced 2024-11-21 01:16:58 +08:00
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
|
|
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.
|