> Sure, but we also have to accept that you might try a h3 request to an old > server on the other side of the globe via a slow network. > A 50-100 ms delay maybe?
I would use 50ms as the default (the lowest in your range 😊). If h3 server is slow to respond then we may waste one or a few connection attempts, but this interval will still help to switch relatively quickly to H2/TCP in case if UDP is blocked by some middleware. Thanks, Dmitry Karpov -----Original Message----- From: Daniel Stenberg <dan...@haxx.se> Sent: Thursday, January 12, 2023 1:56 PM To: Dmitry Karpov via curl-library <curl-library@lists.haxx.se> Cc: Dmitry Karpov <dkar...@roku.com> Subject: [EXTERNAL] Re: HTTP/3 options On Thu, 12 Jan 2023, Dmitry Karpov via curl-library wrote: > Daniel, a question about the "Happy eyeballs everything!" section in > the blog. Is the "happy eyeballs" interval between H3 and H2 going to > be controlled by the same option as the interval between IPv6 and IPv4 > or there will be a special option for that? I imagine that we start out with a fixed mostly arbitrary delay that we think works and then if someone insists and gives a good reason we make it an option. > I am asking because QUIC in H3 is supposed to provide a very quick > connection start, so the HE interval between H3 and H2 can be made > shorter than between IPv6 and IPv4, thus allowing faster switch to > H2/H1 if UDP is blocked. Sure, but we also have to accept that you might try a h3 request to an old server on the other side of the globe via a slow network. A 50-100 ms delay maybe? -- / daniel.haxx.se | Commercial curl support up to 24x7 is available! | Private help, bug fixes, support, ports, new features | https://curl.se/support.html -- Unsubscribe: https://lists.haxx.se/listinfo/curl-library Etiquette: https://curl.se/mail/etiquette.html
