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Re: HTTP/3 options
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From: Dmitry Karpov via curl-library <curl-library_at_lists.haxx.se>
Date: Thu, 12 Jan 2023 22:17:21 +0000
> 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 <daniel_at_haxx.se>
Sent: Thursday, January 12, 2023 1:56 PM
To: Dmitry Karpov via curl-library <curl-library_at_lists.haxx.se>
Cc: Dmitry Karpov <dkarpov_at_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
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| Private help, bug fixes, support, ports, new features
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Date: Thu, 12 Jan 2023 22:17:21 +0000
> 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 <daniel_at_haxx.se>
Sent: Thursday, January 12, 2023 1:56 PM
To: Dmitry Karpov via curl-library <curl-library_at_lists.haxx.se>
Cc: Dmitry Karpov <dkarpov_at_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.htmlReceived on 2023-01-12