تدريب Shadowing: Proxy vs Reverse Proxy (Real-world Examples) - تعلم التحدث بالإنجليزية عبر الفيديو
جارٍ إنشاء الدرس...
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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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المفردات وملاحظات التحدث لهذا الدرس
هذا الدرس في المحادثة مبني على الفيديو “Proxy vs Reverse Proxy”. أكثر الكلمات تكرارًا في الفيديو: proxy, reverse, client, server, forward. يحتوي هذا الفيديو على 58 جملة و786 كلمة للتدرب على الترديد. مدة الكلام 5:06. يتكلم المتحدث بسرعة طبيعية، نحو 154 كلمة في الدقيقة، قريبة من المحادثة اليومية. 68% فقط من الكلمات ضمن أكثر 3,000 كلمة شيوعًا في الإنجليزية، فالمفردات صعبة نسبيًا.
أهم المفردات في هذا الفيديو
15 كلمة من الفيديو تستحق التعلّم، مع النطق والمعنى:
| الكلمة | النطق | المعنى |
|---|---|---|
| proxy اسم | /ˈpɹɑk.si/ | إِنَابَة, اِسْتِنَابَة |
| server اسم | /ˈsɝvɚ/ | خَادُوم m or خَادِم, مُلَقِّم |
| layer اسم | /ˈleɪ̯ɚ/ | طَبَقَة |
| connect فعل | /kəˈnɛkt/ | رَبَطَ |
| transparent صفة | /tɹænsˈpæɹənt/ | شَفَّاف |
| cloud اسم | /ˈklaʊ̯d/ | سَحَاب, غَيْم |
| institution اسم | /ˌɪn.stɪˈtʃuː.ʃən/ | مُؤَسَّسَة |
| distribute فعل | /dɪˈstɹɪbjuːt/ | وَزَّعَ |
| restriction اسم | /ɹɪˈstɹɪkʃən/ | تَقْيِيد, اِقْتِصَار |
| intercept فعل | /ɪntɚˈsɛpt/ | اِعْتَرَضَ |
| topic اسم | /ˈtɑpɪk/ | مَوْضُوع, مَوَاضِيع |
| technique اسم | /tɛkˈniːk/ | أُسْلُوب, تِقْنِيَة |
| reveal فعل | /ɹɪˈviːl/ | كَشَفَ |
| visible صفة | /ˈvɪzɪb(ə)l/ | مَنْظُور |
| summary اسم | /ˈsʌm.ə.ɹi/ | خُلَاصَة, مُلَخَّص |
نطق يحتاج إلى انتباه
- أصوات “sh” و“zh”: cache /kæʃ/, institution /ˌɪn.stɪˈtʃuː.ʃən/, restriction /ɹɪˈstɹɪkʃən/, potentially /pəˈtɛnʃ(ə)li/, encryption /ɪnˈkɹɪpʃən/
- الكلمات الطويلة — انتبه لموضع النبر: institution /ˌɪn.stɪˈtʃuː.ʃən/, potentially /pəˈtɛnʃ(ə)li/, computationally /ˌkɑmpjʊˈteɪʃənəli/
أصوات يجدها متحدثو العربية صعبة:
- /p/ — ليس /b/: انطقه مع نفخة هواء: proxy /ˈpɹɑk.si/, transparent /tɹænsˈpæɹənt/, provider /pɹəˈvaɪ.də(ɹ)/, bypass /ˈbaɪpæs/, intercept /ɪntɚˈsɛpt/
- /v/ — ليس /f/: مع اهتزاز الأوتار الصوتية: reverse /ɹɪˈvɝs/, server /ˈsɝvɚ/, provider /pɹəˈvaɪ.də(ɹ)/, reveal /ɹɪˈviːl/, visible /ˈvɪzɪb(ə)l/
- تتابع الصوامت — لا تضف حركة بينها: proxy /ˈpɹɑk.si/, connect /kəˈnɛkt/, transparent /tɹænsˈpæɹənt/, cloud /ˈklaʊ̯d/, institution /ˌɪn.stɪˈtʃuː.ʃən/
كيف تتدرب بهذا الفيديو
- استمع إلى الفيديو كاملًا مرة واحدة دون أن تتكلم، ودوّن الكلمات التي لا تعرفها.
- ابدأ بسرعة 0.75×، وردّد جملة جملة، ثم عُد إلى السرعة العادية عندما يصبح الأمر سهلًا.
- سجّل صوتك وقارنه بالأصل، مع الانتباه إلى كلمات مثل proxy, server, layer.
ما هي تقنية التظليل الصوتي؟
التظليل الصوتي (Shadowing) تقنية تعلم لغة مدعومة علمياً، طُورت أصلاً لتدريب المترجمين الفوريين المحترفين. الطريقة بسيطة لكنها قوية: تستمع لصوت إنجليزي أصلي وتكرره فوراً بصوت عالٍ — كظل يتبع المتحدث بتأخير 1-2 ثانية. تُظهر الأبحاث تحسناً كبيراً في دقة النطق والتنغيم والإيقاع وربط الأصوات والاستماع والطلاقة.