シャドーイング練習: Proxy vs Reverse Proxy (Real-world Examples) - 動画で英語スピーキングを学ぶ

レッスンを作成中...
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Why is Nginet called a reverse proxy?
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What is a proxy anyways?
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Let's take a look.
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Two common types of proxy are forward proxy and reverse proxy.
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A forward proxy is a server that sits between a group of client machines and the internet.
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When those clients make requests to websites on the internet the forward proxy acts as a middleman intercepts those requests
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and talks to the web servers on behalf of those client machines why would anyone want to do
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that here are a few reasons one a forward proxy protects
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the client's online identity by using a forward proxy to connect
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to a website the ip address of the client is hidden
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from the server only the ip address of the proxy is visible, it would be harder to trace back to the client.
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Two, a forward proxy can be used to bypass browsing restrictions.
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Some institutions like governments, schools, and big businesses use firewalls to restrict access to the internet.
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By connecting to a forward proxy outside the firewalls, the client machine can potentially get around these restrictions.
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It does not always work because the firewalls themselves could block the connections to the proxy.
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3. A forward proxy can be used to block access to certain content.
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It is not uncommon for schools
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and businesses to configure the networks to connect all clients to the web through the proxy
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and apply filtering rules to disallow sites like social networks.
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It is worth noting that a forward proxy normally requires a client to configure its application to point to it.
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For large institutions, they usually apply a technique called transparent proxies to streamline the process.
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A transparent proxy works with layer 4 switches to redirect certain types of traffic to the proxy automatically.
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There is no need to configure the client machines to use it.
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It is difficult to bypass a transparent proxy when the client is on the institution's network.
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In summary, a forward proxy sits between the client and the internet and acts on behalf of the client.
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Now let's take a look at the reverse proxy.
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A reverse proxy sits between the internet and the web servers.
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It intercepts the requests from the clients and talks to the web server on behalf of the clients.
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Why would a website use a reverse proxy?
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Here are a few good reasons.
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One, a reverse proxy could be used to protect a website.
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The website's IP addresses are hidden behind the reverse proxy and are not revealed to the clients.
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This makes it much harder to target a DDoS attack against a website.
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Second, a reverse proxy is used for load balancing.
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A popular website handling millions of users every day is unlikely to be able to handle the traffic with a single server.
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A reverse proxy can balance a large amount of incoming requests
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by distributing the traffic to a large pool of web servers and effectively preventing any single one of them from becoming overloaded.
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Note that this assumes that the reverse proxy can handle the incoming traffic.
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Services like Kyle Flare put reverse proxy servers in hundreds of locations all around the world.
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This puts the reverse proxy close to the users and at the same time provides a large amount of processing capacity.
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Third, a reverse proxy caches static content.
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A piece of content could be cached on the reverse proxy for a period of time.
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If the same piece of content is requested again from the reverse proxy, the locally cached version could be quickly returned.
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Fourth, a reverse proxy can handle SSL encryption.
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SSL handshake is computationally expensive.
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A reverse proxy can free up the origin servers from those expensive operations.
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Instead of handling SSL for all clients, a website only needs to handle SSL handshake from a small number of reverse proxies.
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Reverse proxies are everywhere.
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For a modern website, it is not uncommon to have many layers of reverse proxies.
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The first layer could be an edge service like Cloudflare.
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The reverse proxies are deployed to hundreds of locations worldwide close to the users.
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The second layer could be an API gateway or load balancer at the hosting provider.
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Many cloud providers combine these two layers into a single ingress service.
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The user would enter the cloud network at the edge close to the user.
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And from the edge, the reverse proxy connects over a fast fiber network to the load balancer, where the request is evenly distributed over a cluster of web servers.
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このレッスンの語彙とスピーキングのポイント

このスピーキングレッスンは、動画「Proxy vs Reverse Proxy」を教材にしています。 繰り返し出てくる語は次のとおりです：proxy, reverse, client, server, forward。 この動画には、シャドーイング用の文が58文、単語が786語あります。 音声の長さは5:06です。 話す速さは1分あたり約154語で、日常会話に近い自然なペースです。 英語の頻出3,000語に含まれる単語は68%だけなので、語彙は難しめです。

この動画の重要語彙

動画に出てくる覚えておきたい単語15語を、発音と意味つきで紹介します。

単語発音意味
proxy 名詞/ˈpɹɑk.si/代理
server 名詞/ˈsɝvɚ/サーバー
layer 名詞/ˈleɪ̯ɚ/層, 膜
connect 動詞/kəˈnɛkt/繋げる
transparent 形容詞/tɹænsˈpæɹənt/透明
cache 名詞/kæʃ/キャッシュ
cloud 名詞/ˈklaʊ̯d/雲, 雲霞
institution 名詞/ˌɪn.stɪˈtʃuː.ʃən/制度
uncommon 形容詞/ʌnˈkɒmən/珍しい
distribute 動詞/dɪˈstɹɪbjuːt/分ける
bypass 名詞/ˈbaɪpæs/迂回路, バイパス
restriction 名詞/ɹɪˈstɹɪkʃən/制限
intercept 動詞/ɪntɚˈsɛpt/阻止する
topic 名詞/ˈtɑpɪk/話題, テーマ
technique 名詞/tɛkˈniːk/技術

注意したい発音

  • 「sh」と「zh」の音: cache /kæʃ/, institution /ˌɪn.stɪˈtʃuː.ʃən/, restriction /ɹɪˈstɹɪkʃən/, potentially /pəˈtɛnʃ(ə)li/, encryption /ɪnˈkɹɪpʃən/
  • 長い単語（アクセントの位置に注意）: institution /ˌɪn.stɪˈtʃuː.ʃən/, potentially /pəˈtɛnʃ(ə)li/, computationally /ˌkɑmpjʊˈteɪʃənəli/

日本語話者が苦手な音：

  • /r/ と /l/ の区別 — /l/ は舌先を歯茎につけ、/r/ はどこにもつけない: reveal /ɹɪˈviːl/, firewall /ˈfaɪ(ə)ɹˌwɔl/, streamline /ˈstriːmlaɪn/
  • /v/ — /b/ にならないように、上の歯を下唇に当てる: reverse /ɹɪˈvɝs/, server /ˈsɝvɚ/, provider /pɹəˈvaɪ.də(ɹ)/, reveal /ɹɪˈviːl/, visible /ˈvɪzɪb(ə)l/
  • /f/ — 「フ」ではなく、上の歯と下唇で出す: behalf /bɪˈhæf/, filter /ˈfɪltɚ/, fiber /ˈfaɪ.bɚ/, configure /kənˈfɪɡə(ɹ)/, firewall /ˈfaɪ(ə)ɹˌwɔl/

この動画での練習方法

  1. まず声を出さずに動画を最後まで聞き、知らない単語をメモします。
  2. まず0.75倍速で一文ずつシャドーイングし、慣れてきたら通常の速度に戻します。
  3. 自分の声を録音して元の音声と比べます。proxy, server, layerなどの単語に特に注意しましょう。

シャドーイングとは？英語上達に効果的な理由

シャドーイング（Shadowing）は、もともとプロの通訳者養成プログラムで開発された言語学習法で、多言語習得者として知られるDr. Alexander Arguelles によって広く普及されました。方法はシンプルですが非常に効果的：ネイティブスピーカーの英語を聞きながら、1〜2秒の遅延で声に出してすぐに繰り返す——まるで「影（shadow）」のように話者を追いかけます。文法ドリルや受動的なリスニングと異なり、シャドーイングは脳と口の筋肉が同時にリアルタイムで英語を処理・再現することを強制します。研究により、発音精度、抑揚、リズム、連音、リスニング力、そして会話の流暢さが大幅に向上することが確認されています。IELTSスピーキング対策や自然な英語コミュニケーションを目指す方に特におすすめです。

シャドーイングのやり方: ステップ別の完全ガイドを読む →