User Agent Header - Web DevelopmentYouTube↗  IA↗(long shot)
Education  11.6K views 24 likes 7 dislikes   23 Feb 2015
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User-Agentヘッダについて補足します
>> Okay, so I want to add a little more about user
User-AgentヘッダはHTTPリクエストにおいて
agents. So it's, it's one of the most important headers in
極めて重要な要素であり
an HTTP request. And when we were doing Reddit, user agents
Redditのようなサイトの利用でも重要です
were really important to us. So we had the site that was
Redditは人気のあるオンラインコミュニティで
online and really popular. And users were always you know, often
ユーザはコメントを書いたりリンクを閲覧したりします
writing scripts to, to pull content out on Reddit. And, you
大抵の場合は非常に便利なサイトです
know, mostly they were doing good things. They were building you
様々な情報にアクセスすることができ
know, tools to, you know, do data collections so they can do
多くの人と意見を交換したりできます
some, you know, cool blog post about how Reddit works and that sort
しかし時に悪用されることもあります
of thing. Sometimes they're doing bad things.
スパムの発信元となったり
You know, there are spammers, you know,
悪徳業者が対象を探しているかもしれません
looking for weaknesses or, you know, looking for ways to game the system.
そこで有効なのがUser-Agentヘッダです
And user agents are important because sometimes, you know, a user would hit us
ユーザが適正なUser-Agentヘッダを有していれば
a little too hard too fast, you know, basically, you know, hurting the
どんなに短いアクセスでも監視できます
website for real users. And if they had a legitimate user agent, we could
または個別にユーザに速度制限を設けたり
look at them. We can you know, rate limit them accordingly or we can
特定のユーザを追跡したりすることもできます
reach out to them and say, hey you know, you are hurting us and
サイトの悪用を防ぐことができるのです
you know, they, they would adjust, and it's cool. The Googlebot is
GoogleのWebクロール用ロボット Googlebotはその良い例です
a really good example of this. The Googlebot is Google's WebCrawler that indexes
Googlebotはサーチエンジンで検索可能なサイトの インデックスを作成します
website for, you know, their search engine. Googlebot would just punish us.
ただGooglebotはサイトに素早くアクセスしますが
They would hit us as fast as they could, and sometimes that would
時にはサイトをスローダウンさせることもあります
actually slow down the site. And until we learned how to handle
そのため速度制限を設ける必要があります
that properly, we would just, you know, rate limit them a little bit.
それによってGooglebotの
And, you know, Googlebot, you know, their feelings weren't hurt, they can
インデックス機能を害する心配はありません
still index the site. We just made them do it slower. But when
偽のUser-Agentヘッダを使うユーザや
people show up with fake user agents and we can tell that,
ブラウザを装ったIPアドレスを検出したら
you know, this one IP and this one user agent is just
それらをブロックすればよいのです
pummeling us and, and they're trying to pretend to be a browser,
ですので他の人の作ったWebサイトと
we would just block them altogether. So, using good user agents when you're
情報をやり取りするようなプログラムを作る際には
writing software that, interacts with other people's websites is, is a really
正常なUser-Agentヘッダを使うのが礼儀です
nice, courteous thing to do. And it's one of the things that
Webをみんなにとって使いやすくするには
makes the web work well for everybody. So it's always important to
適正なUser-Agentヘッダが必要です
have a nice accurate user agent and to be honest when you can.
Webプログラムを作成するときには
>> Okay, now that I'd like you to do is promise
User-Agentヘッダを正しく使うことを ここで約束してください
to always use user agents appropriately when you're writing your web software.
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