fix: enforce -pr http11 across retry fallback path#2421

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juzigu40-ui:codex/v100-httpx-2240

Commits on Mar 4, 2026

fix(httpx): enforce http11 retry path to avoid h2 fallback (#2240)

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test(httpx): restore GODEBUG in http11 fallback test isolation

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test(httpx): harden http11 fallback regression coverage

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fix(httpx): honor mixed-case http11 protocol checks

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