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Handle Rack 3 inputs, headers, and streaming responses - #493

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ydah wants to merge 1 commit into
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fix-rack3-middleware-compatibility
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ydah wants to merge 1 commit into
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fix-rack3-middleware-compatibility

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@ydah

@ydah ydah commented Oct 11, 2026

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Rack 3 permits non-rewindable request input and call-only response bodies, and requires lowercase response header names (Rack specification). These cases previously raised NoMethodError or Rack::LintError in Committee.

Guard request-body rewinds, emit lowercase content-type headers, and pass call-only response bodies through. Add Rack::Lint and streaming-body regression tests.

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