Web Applications - Web DevelopmentYouTube↗  IA↗(long shot)
Education  19.5K views 59 likes 4 dislikes   02 Jun 2014
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これまでで基本的なブラウザ、HTML、 HTTPについて学んできました
Okay. So now, we've discussed basic browsers, HTML, HTTP, which is
HTTPでブラウザとサーバの 交信方法についても説明しましたので
how the browsers talk to the servers. And now, we're finally
いよいよこのコースのメインテーマである サーバ上でのプログラムについてです
going to get to servers, which is what most of this course is going to be about. How to run programs on servers. The
サーバの目的はHTTPリクエストに応えることです
purpose of a server is to respond to HTTP requests. We've
またこの図を使って説明します
drawn this picture a couple of times now. This is you.
あなた、ブラウザを動かすコンピュータ、
This is your computer running your browser. And these are our
そしてこれがサーバです　ブラウザはHTTPを使って
servers. These little pink boxes. Your browser is speaking HTTP to these
サーバに文書をリクエストします
servers to request documents. There are two
サーバのレスポンスには2つの分類があります
main classifications for the type of responses the
レスポンスは静的か動的に分類されます 静的なコンテンツとはサーバがそのまま返せる
server will do. They are called static and dynamic. Content is considered static if it's
あらかじめ書き込まれたファイルのことをいいます
a pre-written file that the server just
代表的なものは画像です
returns. An example would be an image. Most
ほとんどの画像ファイルは静的リクエストで
images are static requests. All the server does
サーバはただ単にハードディスク上かキャッシュから
is says, it looks up the image off of its hard disk or off of its cache, and just
画像を探してくるだけです 動的リクエストはもう少し複雑で
sends it over the wire using HTTP. More interesting requests are dynamic
実行中のプログラムがレスポンスを
requests. These are requests where the response is built on the
オンザフライで作り上げます 最近ではオンライン上の
fly by a program that's running. Just about all of the content
ほとんどのコンテンツは動的ですが 少し前までは違いました
online these days is dynamic. That didn't always use to be
Webが開発されたばかりの90年代初頭は
the case. When the web was first invented in the early 90s,
コンテンツはほとんど静的なファイルでした
almost all of the content online was static. They were just
人々はファイルを編集しサーバにアップして 他のファイルにリンクさせていました
files. People would edit the files, put them on their servers, and they all linked to one another, but that was
しかし現在ではUdacity、Reddit、Hipmunkを始め WikipediaもFacebookも
that. These days, almost every website including Udacity, Reddit
ほとんどのWebサイトにおいて
and Hipmunk, the two websites that I worked on.
そのページの100%近くが動的で
Wikipedia, Facebook. All of those pages, almost 100% of
オンザフライで作られています
them are built dynamically on the fly by programs
それを可能にするプログラムが Webアプリケーションです
called web applications. And a web application is just
Webアプリケーションとは コンテンツを生成するプログラムで
a program that generates content. And that is what we're going to learn how to build in this course.
Webサーバ上に存在しHTTPを操り
So we've spent all of this time getting to this description of what a web application does. Which
ブラウザがリクエストするコンテンツを生成します
is, it lives on a web server, it speaks
このコースではWebアプリケーションの作り方を 学んでいきます
HTTP, and it generates content that your browser requests.
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