feat: replace httpx by httpx2 - #4974
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`httpx2` is the Pydantic-maintained fork of `httpx` 0.28.1 with an identical public API. Switch the `testing` extra to `httpx2>=2.5` and rename the imports across `litestar/testing`. The SSE tests and the jwt header assertions move too: they stop type-checking the moment `subprocess_*_client` and `AsyncTestClient` become httpx2 types, and httpx2 2.10 narrowed `Headers.get` to `str | None`. `httpx` stays pinned in the dev group until `tools/` and the remaining direct users migrate.
`client.sse()` landed in httpx2 2.5 and covers what `httpx-sse` gave us, so drop the dependency.
Retires the temporary `httpx` pin from the dev group; `httpx`, `httpcore` and `httpx-sse` are no longer resolved at all.
Covers the test client base classes, the `httpx2` logger name, the `python-httpx2` User-Agent and the new dependency floors. The CSRF example in the middleware docs stays on `httpx`: it demonstrates calling a running server with your own client and offers `requests` as an equal alternative, so it should not track Litestar's test-client choice.
Kumzy
requested review from
a team,
JacobCoffee and
provinzkraut
as code owners
August 10, 2026 10:49
Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #4974 +/- ##
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Coverage 67.19% 67.19%
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Files 293 293
Lines 15363 15363
Branches 1745 1745
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Hits 10323 10323
Misses 4890 4890
Partials 150 150 ☔ View full report in Codecov by Harness. 🚀 New features to boost your workflow:
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This PR aim to replace
httpxfor thetestingextra byhttpx2library.As httpx is no longer maintained and won't receive any updates regarding future versions of Python, I suggest to change the library behind the TestClient for the 3.x release.
The API behind is mostly the same
📚 Documentation preview 📚: https://litestar-org.github.io/litestar-docs-preview/4974