lix/doc/manual/rl-next/http3.md at 7e193f962e35217268e81164eef9f8be7059a84e

guiwf/lix

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Raito Bezarius 7e193f962e libstore/filetransfer: support HTTP/3 transfers if the user requests it

This adds the enablement code to support HTTP/3 if the user requests it.

We leave it disabled because h3 is not onpar with h2 performance.

Change-Id: I1fd3d4c97b972dcf36bccacc6c9a8290e22b31e0
Signed-off-by: Raito Bezarius <raito@lix.systems>

2025-11-17 19:11:32 +00:00

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synopsis, issues, category, credits

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Lix supports HTTP/3 behind `--http3`

fj#1033

Features

raito

horrors

Lix now supports HTTP/3 for file transfers when the linked curl version supports it.

By default, HTTP/3 is disabled notably due to performance issues reported in mid-2024. More details here.

As of 2025-11-14, NixOS official cache supports HTTP/3 via Fastly. More info here.

To enable HTTP/3:

Use --http3 for individual transfers.
Add http3 = true in your Nix configuration for permanent activation.

To disable it, use --no-http3.

Note:

--no-http2 --http3 will still enable both HTTP/2 and HTTP/3.
--http2 --http3 will prioritize HTTP/3 and fall back to HTTP/2 (and then HTTP/1.1).

These are current CLI limitations. In the future, we plan to replace --httpX options with --max-http-version [1,2,3] for easier version selection in Lix transfers.

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