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Migrate airflow-core to httpx2 - #74244
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httpx has stalled: fixes that landed in httpx2 (a fork of httpx 0.28.1) have not shipped upstream, and starlette has already migrated, so FastAPI following is a matter of time. Moving the Execution API client now keeps the SDK on a maintained HTTP stack. Objects do not cross the httpx/httpx2 boundary, so the in-process Execution API transports move with the client that consumes them; the rest of airflow-core stays on httpx and migrates separately. related: apache#70522
Compat tests pair the repo's devel-common helpers with a released Airflow whose Task SDK is still on httpx. Pinning the helper to httpx2 hands those clients a transport from the wrong package, and httpx rejects the response stream it gets back.
Every other third-party hook in the repo pins an immutable SHA; a mutable tag lets the hook change under CI without a diff.
Both HTTP stacks can coexist while compatibility jobs use older SDK distributions. The migration needs regression coverage for its logging behavior without exposing development-only helpers as public APIs.
Tests added on main for in-process shutdown still referenced httpx, which this branch no longer imports in the module.
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What?
airflow-core's usage ofhttpxtohttpx2, following the general migration guidance here.httpx2#73116) since there is some code overlap.ast-greppre-commit check to prevent re-introducinghttpxin the Task SDK, mirroring the providers one.Why?
httpxusage forhttpx2#70522httpx2#73116Was generative AI tooling used to co-author this PR?
Code changes Generated-by: [Claude Code, Opus extra-high effort] following the guidelines
Self-reviewed and adjusted as needed by hand
PR description hand-written
Additional Notes
providersis already merged. See Migrate google + pagerduty + anthropic providers tohttpx2#72111main.