.changelog/1750957379.md
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fix hyper 1.x connection refused errors not marked as retryable (#4190)
## Description internal ref: `V1820425457` Fixes a regression in the way connection issues are classified which was causing them to not be retried when using the hyper 1.x client. The issue is the logic for [classifying the error](https://github.com/smithy-lang/smithy-rs/blob/release-2025-06-11/rust-runtime/aws-smithy-http-client/src/client.rs#L401) was never being hit because connection errors are no longer `hyper::Error` they are `hyper_util::client::legacy::Error`. * [hyper-util::Error](https://docs.rs/hyper-util/0.1.14/hyper_util/client/legacy/struct.Error.html) * [hyper@1.x::Error](https://docs.rs/hyper/1.6.0/hyper/struct.Error.html) * [hyper@0.14.x::Error](https://docs.rs/hyper/0.14.32/hyper/struct.Error.html#method.is_connect ) ## Testing New unit test plus verification against internal package that opened the issue. ## Checklist <!--- If a checkbox below is not applicable, then please DELETE it rather than leaving it unchecked --> - [x] For changes to the smithy-rs codegen or runtime crates, I have created a changelog entry Markdown file in the `.changelog` directory, specifying "client," "server," or both in the `applies_to` key. ---- _By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice._ --------- Co-authored-by:Landon James <lnj@amazon.com>