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   daniel:// stenberg:// (bagder@mastodon.social)'s status on Friday, 11-Aug-2023 06:12:11 JST daniel:// stenberg://

   Trying to explain happy eyeballs in a slide... (for the coming " mastering #curl...." presentation)

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     daniel:// stenberg:// (bagder@mastodon.social)'s status on Friday, 11-Aug-2023 06:12:08 JST daniel:// stenberg://

     in reply to

     • Jeroen Massar

     @jeroen happy eyeballs v2 is mostly a pipe dream unless you control every single layer, like Apple does and basically nobody else

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     feld (feld@bikeshed.party)'s status on Friday, 11-Aug-2023 06:12:08 JST feld

     in reply to

     • Jeroen Massar
     can you expand upon that? What are all the different layers? I was thinking if the kernel and libc were good to go, you're probably going to be able to benefit from it
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     Jeroen Massar (jeroen@secluded.ch)'s status on Friday, 11-Aug-2023 06:12:10 JST Jeroen Massar

     in reply to

     @bagder you do also do happy eyeballs over multiple IPv4 addresses and multiple IPv6 ones right? ;)

     And note that Apple published v2: https://www.rfc-editor.org/rfc/rfc8305 MacOS/iOS/etc editions have a lot more tricks to connect to the fastest (latency & bandwidth) place, if you use the right APIs to connect it is even quite simple -- but often not available for glibc ;)

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     feld (feld@bikeshed.party)'s status on Friday, 11-Aug-2023 06:18:30 JST feld

     in reply to

     • Jeroen Massar
     Are you saying that it returns the addresses from A/AAAA queries back to the caller as it gets them instead of returning everything together? (which could obviously have delays in some situations, slowing the response time on that simple DNS resolution task... )
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     daniel:// stenberg:// (bagder@mastodon.social)'s status on Friday, 11-Aug-2023 06:18:31 JST daniel:// stenberg://

     in reply to

     • feld
     • Jeroen Massar

     @feld @jeroen the main problem with "better" happy eyeballs is to get the addresses back while the responses are arriving. There is no libc API for that. You need a custom resolver for that.

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     daniel:// stenberg:// (bagder@mastodon.social)'s status on Friday, 11-Aug-2023 06:22:25 JST daniel:// stenberg://

     in reply to

     • feld
     • Jeroen Massar

     @feld @jeroen I say it needs to, to do v2 happy eyeballs. getaddrinfo() returns them all at once.

     This said, Apple does a lot of other magic too, like caching info about success/failure per IP address etc

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     feld (feld@bikeshed.party)'s status on Friday, 11-Aug-2023 06:22:25 JST feld

     in reply to

     • Jeroen Massar
     Wow that's crazy, but pretty neat.