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@r-plus r-plus commented Dec 24, 2025

Rack 3 required lowercase header key.

Response header keys can no longer include uppercase characters.

https://github.com/rack/rack/blob/main/UPGRADE-GUIDE.md

This PR fixed throttled_responder example in README for Rack 3 & 2 compatible.

this is Rack::Lint error when use.

Puma caught this error: uppercase character in header name: RateLimit-Limit (Rack::Lint::LintError)

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