{
  "id": 9700557,
  "title": "Day 20 — CDN ও Edge Caching — সার্ভারকে বিশ্রাম দিন",
  "url": "https://urgent.news/2026/09/25/day-20-cdn-edge-caching",
  "topic": "tech",
  "section": "Tech",
  "published": "2026-09-25T04:20:00.000Z",
  "source": {
    "name": "Dev.to",
    "slug": "dev-to",
    "url": "https://dev.to/mislam-dev/day-20-cdn-o-edge-caching-saarbhaarke-bishraam-din-56gp"
  },
  "original_language": "en",
  "account": "Day 20 saw the introduction of CDN and Edge Caching, aimed at reducing the load on servers. The writer had already developed and deployed an application on a Bangladesh server, which went viral, causing delays in data delivery to users in Australia due to high latency. The long distance between the two countries, approximately 7,500 kilometers, contributed to the slow data transmission, taking 300-500ms depending on the size of the data. Locally loading the data also took a significant amount of time, potentially leading to a drop in user engagement. To address this latency issue, CDN emerged as a solution. By setting up servers across various locations worldwide and having them work together, CDN stores data and automatically replicates it to each server, allowing users in Australia to access the data from the server closest to them, significantly improving the speed. Implementation of CDN can result in a latency reduction of up to 10 times. However, it's important to note that CDN does not only cache data; it also handles cache invalidation when data changes. Caching can be applied to static assets like images, CSS, JS, and fonts, as well as HTML pages generated through Static Site Generation, and API responses. Proper cache headers should be set to allow CDN caching. Not everything should be cached, as inconsistencies may arise. The article also discusses caching strategies in detail. Generally, static assets such as /assets/logo.png and /dist/bundle.js, and API responses should be cached on CDN. Image optimization services like Cloudinary and ImageKit can help in resizing, compressing, and converting image formats for delivery. Cache invalidation can be problematic, and one solution is Cache Busting, where unique hashes are added to file URLs, forcing browsers and CDNs to fetch the new file. Ultimately, CDN not only improves performance but also reduces costs, increases availability, and enhances security. Setting up CDN with services like Cloudflare or AWS CloudFront is highly recommended. Have you set up CDN for your project? If not, why not? Comment below!",
  "summary": "আপনি অনেক কষ্ট করে একটি application develop করলেন। Deploy করলেন বাংলাদেশের একটি server-এ। খুব সুন্দরভাবে সবকিছু চলছিল। কিন্তু হঠাৎ করে আপনার এই application-টি viral হয়ে গেল। এখন Australia থেকে কেউ আপনার application-টি try করতে চাইল। কিন্তু সবকিছু অনেক দেরিতে show হচ্ছে। Latency অনেক বেশি। মোটামুটি অনেক time লেগে যাচ্ছে, wait করতে হচ্ছে। HTTP কীভাবে কাজ করে, এটা বুঝতে পারলে, কেন এমন হচ্ছে তা সহজেই…",
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}