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Rails 6.1で導入されたDNSリバインディング攻撃の対策を、明示的にdevelopment環境でのみ有効化するように変更するPRです。
https://railsguides.jp/configuring.html#actiondispatch-hostauthorization
既定ではdevelopment環境でのみ有効なのですが、 #1721 でCataloupeからEnju本体にアクセスさせるために設定を変更したところ、development環境以外でもこの設定が有効になってしまい、アプリケーションにアクセスできなくなってしまいました。