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#51 modified the application to use rack from ActionDispach, but the effect of this change caused the existing application to stop working.
Specifically, the same implementation as in this comment(#10 (comment)) is not able to use to_io due to the type change, resulting in a NoMethodError.
I would like to revert from rack to ActionDispach, and also upgrade to version 7.0.3.1 to be compatible with Rails 7.
If this is ok, please use this pull request.