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ci: force HTTP/1.1 + retries for crates.io fetches (fix HTTP/2 download flake) #1020

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Merged
andymai merged 1 commit into from
Jun 26, 2026
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ci: force HTTP/1.1 + retries for crates.io fetches (fix HTTP/2 download flake) #1020

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12 changes: 12 additions & 0 deletions .cargo/config.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -7,3 +7,15 @@ xtask = "run --manifest-path xtask/Cargo.toml --"
# via xtask (disable with --no-simd). Not set here because rustflags in
# config.toml overrides (doesn't append to) env RUSTFLAGS, and CI sets
# RUSTFLAGS=-Dwarnings globally.

# crates.io dependency downloads intermittently fail on CI runners with
# "[16] Error in the HTTP2 framing layer" (criterion's transitive deps —
# cast/alloca/oorandom/itertools — and others), reddening otherwise-passing
# jobs. Force HTTP/1.1 (sidesteps the HTTP/2 multiplexing fault) and retry
# transient network failures so dependency fetches are reliable. Downloads
# only matter on a cold cache (mostly CI), so the local-dev cost is negligible.
[http]
multiplexing = false

[net]
retry = 10
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