February 2013
Intermediate to advanced
380 pages
7h 45m
Japanese
Content preview from Nodeクックブック
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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.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.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.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.
135
5
章
Websocket
を使って
Ajax
を超える
はじめに
今日でこそ多くの開発者がリアルタイム
Web
アプリケーションを開発していますが、もともと
HTTP
はリアルタイムに適したプロトコルではありませんでした。そこで、
HTTP
にリアルタイ
ム性を持たせるためのクリエイティブで多様な迂回方法が開発され、サーバ・クライアント間の双
方向で途切れのない連続したコミュニケーションが実現しました。
WebSocket
は既存の仕様を利用、もしくは迂回して双方向コミュニケーションを実現するので
はなく、双方向コミュニケーションを提供することを目的に新たに策定されたプロトコルです。
WebSocket
は、
HTTP
を取り去って永続的に
TCP
ライクな通信を行うことによって、
HTTP
プロ
トコルによって発生するオーバーヘッドや機能制限を取り除いています。
クライアントから、
WebSocket
へのアップグレードを求める
GET
リクエストをサーバに送信
し、サーバが
WebSocket
に対応しているかどうかを判断します。ブラウザとサーバが両方とも
WebSocket
に対応している場合、
HTTP
接続は取り去られ「アップグレード」されます。最近リ
リースされているブラウザ（
IE 10
、
Chrome 14
、
Safari 5
、
Firefox 6
以上）は
WebSocket
をサ
ポートしています。
WebSocket
は新しいプロトコルですが、
JavaScript
と
Node
の組み合わせを使えば、
WebSocket
プロトコルを十分に実装できます。 ...
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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.