May 2019
Intermediate to advanced
464 pages
9h 22m
Japanese
Content preview from Node.jsデザインパターン 第2版
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190
6
章 オブジェクト指向デザインパターンの
Node.js
への適用
ここで、
req
は到着する
HTTP
リクエスト、
res
はレスポンス、
next
は現在のミドルウェアが処理
が完了したときに起動されるコールバックで、パイプライン上の次のミドルウェアを呼び出します。
Express
のミドルウェアが実行する処理の例には次のようなものがあります。
●
リクエストのボディの解析
●
リクエストとレスポンスの圧縮
/
展開
●
アクセスログの作成
●
セッションの管理
●
暗号化されたクッキーの管理
●
C
シーサーフ
SRF
（クロスサイトリクエストフォージェリ）の防御の提供
考えてみると、こういったものはすべて厳密にはアプリケーションの主たる機能に関連したものでは
なく、ウェブサーバの必要最小限のコアに必須な部品とも言えません。それよりもアクセサリー、つま
りアプリケーションの周辺業務へのサポートを提供し、実際のリクエストハンドラが主要な業務ロジッ
クのみに集中できるようにするコンポーネントと言ったほ
うがふさわしいでしょう。基本的には、その
ような作業は「間
ミ ド ル ウ ェ ア
にあるソフトウェア」の仕事です。
6.9.2
パターンとしてのミドルウェア
Express
にミドルウェアを実装するために使われている技法は新しいものではありません。実際に、
インターセプトフィルタ（
Intercepting Filter
）パターンと責任連鎖（
Chain of Responsibility
）パターンを
Node
によって実現したものとみなす ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.