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this commit introduces a new body middleware, `Chain<A, B>`. similar to [`std::iter::Iterator::chain()`], this provides an adapter to join two bodies together. a new [`BodyExt::chain()`] trait method is introduced as a facility to create a chained body using `a.chain(b)` syntax. that method will return a new [`Body`][http_body::Body] that emits the contents of the first body, and then emits the contents of the second body. If the first body returns an error, the body will consider itself finished and will not poll the second body. a test suite is included to confirm that this properly handles state transitions for empty bodies, errors, and trailers. the test suite also includes assertions to show that hints (`is_end_stream()` and `size_hint()`) work properly. Signed-off-by: katelyn martin <git@katelyn.world>
cratelyn
marked this pull request as ready for review
August 28, 2026 15:54
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this commit introduces a new body middleware,
Chain<A, B>.similar to
std::iter::Iterator::chain(), this provides an adapter to join two bodies together. a newBodyExt::chain()trait method is introduced as a facility to create a chained body usinga.chain(b)syntax.that method will return a new
http_body::Bodythat emits the contents of the first body, and then emits the contents of the second body. if the first body returns an error, the body will consider itself finished and will not poll the second body.a test suite is included to confirm that this properly handles state transitions for empty bodies, errors, and trailers. the test suite also includes assertions to show that hints (
is_end_stream()andsize_hint()) work properly.