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本書は、ブログ「hp12c」(http://melborne.github.com/) における「エラーメッセージから学ぶRack(3連載)」および「マトリョーシカはRackだけのものじゃない、あなたのRubyにもマトリョーシカを!」の記事の電子書籍版です。rackupコマンドの実行に対するエラー出力を追っていきながら、Rackを学ぶチュートリアルになっています。 (目次) 1章 Rack、最初の一歩 2章 Rack、Middlewareの魔法 3章 僅か100行のLackで学ぶRackの中身 4章 あなたのRubyにもマトリョーシカを! 謝辞 文庫本換算で145頁相当、DRMフリーです。

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