On Tue, 3 Jan 2023, Timothe Litt via curl-library wrote:
Thanks, this is certainly an interesting idea.
--http=3 - use http3, fall back to 2, 1.1, 1.0, 0.9, ...
We don't use '='-separators in our option parser so unless we introduce it
now, it would rather be
--http 3
"0.9" is never a version used in (curl) requests, it is prehistoric
*response*. I don't think should mix 0.9-acceptance into this option.
--http=3. use http3 or die
--http=(3,1.1) - try http3, fall back to 1.1, 1.0...
--http=(3,1.1.) - try http3, 1.1 or die
--http=2. = Use http2 or die (roughly --http2 --http-prior-knowledge)
Maybe the period is a too subtle as a "stop" as it is also used in "1.1".
How about a slight tweak of the syntax:
"3-" means version 3 or anything else that curl thinks is fine
"3" means only version 3
"3-2" means version 2 or fallback to 2 (excluding 1.1)
"3-1.1" means version 3 or fallback to 2 or 1.1
"3,1.1" means version or fallback to 1.1
"1.0" means please use 1.0 (only)
Details:
It cannot ever fallback to 1.0, so having "3-1.0" will not make curl
actually try 1.0 in the request.
Using "0.9" in the string would be invalid, it is never used in requests.
We could accept version "1" as a shortcut for "1.1".
This leaves room for expanding to a future version 4.
alt-svc really should be internal to CURL - e.g. in ~/.curl-altsvc.cache or
some such.
Maybe. That would introduce challenges when you run a bazillion different
concurrent curls, potentially with lots of different use cases and testing and
torturing internal and external sites.
Also, alt-svc as a technology does not seem to have a very bright future so
I'm not convinced it is worth us spending a lot of efforts on fine tuning how
to use this. The future rather looks like an updated header and use of the
HTTPS record.
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