---
title: CDN Basics
---

[![BlazingCDN](https://blog.blazingcdn.com/hubfs/Logo/blog-logo-w.png)](https://blog.blazingcdn.com?hsLang=en)

[📘Learn ▾](https://blog.blazingcdn.com/cdn-learn?hsLang=en)

[CDN Fundamentals](https://blog.blazingcdn.com/cdn-fundamentals?hsLang=en) [By Content Type](https://blog.blazingcdn.com/by-content-type?hsLang=en) [Advanced Concepts](https://blog.blazingcdn.com/advanced-concepts?hsLang=en) [Glossary](https://blog.blazingcdn.com/glossary?hsLang=en)

[⚡ Web Performance](https://blog.blazingcdn.com/web-performance?hsLang=en)

[🎬Video & Streaming ▾](https://blog.blazingcdn.com/video-streaming-cdn?hsLang=en)

[🔴 Live Streaming](https://blog.blazingcdn.com/live-streaming?hsLang=en) [📺 VOD & OTT](https://blog.blazingcdn.com/vod-ott?hsLang=en) [💰 Bandwidth & Costs](https://blog.blazingcdn.com/bandwidth-costs?hsLang=en)

[🏭 Other Industries ▾](https://blog.blazingcdn.com/cdn-industry-insights?hsLang=en)

[📺 Media & Broadcasting](https://blog.blazingcdn.com/media-broadcasting?hsLang=en) [💾 Software & SaaS](https://blog.blazingcdn.com/software-saas?hsLang=en) [🏗️ DevOps & Cloud Infra](https://blog.blazingcdn.com/devops-cloud-infra?hsLang=en) [📚 AdTech & Advertising](https://blog.blazingcdn.com/adtech-advertising?hsLang=en) [🎮 Gaming & Esports](https://blog.blazingcdn.com/gaming-esports?hsLang=en) [📱 Mobile Apps & Developers](https://blog.blazingcdn.com/mobile-apps-developers?hsLang=en) [🤖 AI & Machine Learning](https://blog.blazingcdn.com/ai-machine-learning?hsLang=en) [🏛️ Enterprise & Corporate](https://blog.blazingcdn.com/enterprise-corporate?hsLang=en) [📚 E-Learning & EdTech](https://blog.blazingcdn.com/e-learning-edtech?hsLang=en) [🏟️ Sports & Live Events](https://blog.blazingcdn.com/sports-live-events?hsLang=en)

[💰 Pricing & Costs ▾](https://blog.blazingcdn.com/cdn-pricing-and-cdn-costs?hsLang=en)

[Provider Pricing](https://blog.blazingcdn.com/provider-pricing?hsLang=en) [Cost Optimization](https://blog.blazingcdn.com/cost-optimization?hsLang=en) [Decision Support](https://blog.blazingcdn.com/decision-support?hsLang=en)

[⚡Compare ▾](https://blog.blazingcdn.com/cdn-comparison?hsLang=en)

[Provider Comparisons](https://blog.blazingcdn.com/provider-comparisons?hsLang=en) [Strategy Comparisons](https://blog.blazingcdn.com/strategy-comparisons?hsLang=en) [Ratings & Benchmarks](https://blog.blazingcdn.com/cdn-ratings-and-benchmarks?hsLang=en)

[📊 Benchmarks](https://blog.blazingcdn.com/cdn-ratings-and-benchmarks?hsLang=en)

[🔒 Security ▾](https://blog.blazingcdn.com/cdn-security?hsLang=en)

[Attack Protection](https://blog.blazingcdn.com/attack-protection?hsLang=en) [Encryption & Access](https://blog.blazingcdn.com/encryption-access?hsLang=en) [Video & DRM Security](https://blog.blazingcdn.com/video-drm-security?hsLang=en)

[📁 Case Studies](https://blog.blazingcdn.com/case-studies) [🔌 Integrations](https://blog.blazingcdn.com/integrations?hsLang=en) [🛠️ Tools](https://blog.blazingcdn.com/cdn-tools?hsLang=en)

[Get Started](https://blazingcdn.com/sign-up-contact-form/)

### [![](https://blog.blazingcdn.com/hubfs/Gemini-Blog/image-Aug-10-2026-09-47-39-9642-AM.png) By BlazingCDN August 10, 2026 Debugging Cache Headers With curl: A Practical Walkthrough](https://blog.blazingcdn.com/en-us/debugging-cache-headers-with-curl-a-practical-walkthrough?hsLang=en)

[![](https://blog.blazingcdn.com/hubfs/Gemini-Blog/image-Nov-02-2026-07-55-36-2777-AM.jpeg) Learn](https://blog.blazingcdn.com/en-us/504-gateway-timeout-causes-and-fixes-behind-a-cdn?hsLang=en)

Learn

## [504 Gateway Timeout: Causes and Fixes Behind a CDN](https://blog.blazingcdn.com/en-us/504-gateway-timeout-causes-and-fixes-behind-a-cdn?hsLang=en)

 A 504 Gateway Timeout behind a CDN means one proxy in the chain (the CDN edge, an origin shield, a load balancer or a reverse proxy) waited for the next hop longer than its ...

 Vadym Borovskyi · Nov 2, 2026, 8:58:02 AM [Read article](https://blog.blazingcdn.com/en-us/504-gateway-timeout-causes-and-fixes-behind-a-cdn?hsLang=en)

[![](https://blog.blazingcdn.com/hubfs/Gemini-Blog/image-Nov-02-2026-05-50-36-4647-AM.jpeg)](https://blog.blazingcdn.com/en-us/502-bad-gateway-what-it-means-and-how-to-fix-it?hsLang=en)

Learn

### [502 Bad Gateway: What It Means and How to Fix It](https://blog.blazingcdn.com/en-us/502-bad-gateway-what-it-means-and-how-to-fix-it?hsLang=en)

Nov 2, 2026, 6:52:50 AM

[![](https://blog.blazingcdn.com/hubfs/Gemini-Blog/image-Nov-02-2026-05-25-08-9163-AM.jpeg)](https://blog.blazingcdn.com/en-us/the-impact-of-cdns-on-global-internet-traffic?hsLang=en)

Learn

### [How CDNs Shape Global Internet Traffic: The Data in 2026](https://blog.blazingcdn.com/en-us/the-impact-of-cdns-on-global-internet-traffic?hsLang=en)

Nov 2, 2026, 6:27:11 AM

[![](https://blog.blazingcdn.com/hubfs/Gemini-Blog/image-Nov-02-2026-04-55-13-2883-AM.jpeg)](https://blog.blazingcdn.com/en-us/how-5g-is-revolutionizing-software-downloads?hsLang=en)

Learn

### [How 5G Changes Software Downloads and Update Delivery](https://blog.blazingcdn.com/en-us/how-5g-is-revolutionizing-software-downloads?hsLang=en)

Nov 2, 2026, 5:57:25 AM

[![](https://blog.blazingcdn.com/hubfs/Gemini-Blog/image-Nov-02-2026-04-25-12-9280-AM.jpeg)](https://blog.blazingcdn.com/en-us/top-cdn-providers-2025-an-expert-guide-to-types-technologies-and-performance-0?hsLang=en)

Compare

### [11 Best CDN Providers in 2026, Tested for Speed, Price and Reach](https://blog.blazingcdn.com/en-us/top-cdn-providers-2025-an-expert-guide-to-types-technologies-and-performance-0?hsLang=en)

Nov 2, 2026, 5:27:36 AM

[![](https://blog.blazingcdn.com/hubfs/Gemini-Blog/image-Nov-02-2026-03-55-15-0137-AM.jpeg)](https://blog.blazingcdn.com/en-us/bunny-cdn-review-2025-performance-startup-budget?hsLang=en)

Pricing - Pricing & Costs

### [Bunny.net CDN Review 2026: Speed, Pricing and Limits Tested](https://blog.blazingcdn.com/en-us/bunny-cdn-review-2025-performance-startup-budget?hsLang=en)

Nov 2, 2026, 4:58:28 AM

[![](https://blog.blazingcdn.com/hubfs/Gemini-Blog/image-Nov-02-2026-03-45-35-5523-AM.jpeg)](https://blog.blazingcdn.com/en-us/cache-control-max-age-vs-s-maxage-browser-and-cdn-ttls?hsLang=en)

Learn

### [Cache-Control max-age vs s-maxage: Browser and CDN TTLs](https://blog.blazingcdn.com/en-us/cache-control-max-age-vs-s-maxage-browser-and-cdn-ttls?hsLang=en)

Nov 2, 2026, 4:48:18 AM

## Latest articles

[View all →](https://blog.blazingcdn.com/blog?hsLang=en)

[![](https://blog.blazingcdn.com/hubfs/Gemini-Blog/image-Nov-02-2026-07-55-36-2777-AM.jpeg)](https://blog.blazingcdn.com/en-us/504-gateway-timeout-causes-and-fixes-behind-a-cdn?hsLang=en)

Learn

### [504 Gateway Timeout: Causes and Fixes Behind a CDN](https://blog.blazingcdn.com/en-us/504-gateway-timeout-causes-and-fixes-behind-a-cdn?hsLang=en)

A 504 Gateway Timeout behind a CDN means one proxy in the chain (the CDN edge, an origin shield, a load ...

Nov 2, 2026, 8:58:02 AM [Read more](https://blog.blazingcdn.com/en-us/504-gateway-timeout-causes-and-fixes-behind-a-cdn?hsLang=en)

[![](https://blog.blazingcdn.com/hubfs/Gemini-Blog/image-Nov-02-2026-05-50-36-4647-AM.jpeg)](https://blog.blazingcdn.com/en-us/502-bad-gateway-what-it-means-and-how-to-fix-it?hsLang=en)

Learn

### [502 Bad Gateway: What It Means and How to Fix It](https://blog.blazingcdn.com/en-us/502-bad-gateway-what-it-means-and-how-to-fix-it?hsLang=en)

A 502 Bad Gateway means a proxy in your request path, such as nginx, a load balancer or a CDN edge, reached ...

Nov 2, 2026, 6:52:50 AM [Read more](https://blog.blazingcdn.com/en-us/502-bad-gateway-what-it-means-and-how-to-fix-it?hsLang=en)

[![](https://blog.blazingcdn.com/hubfs/Gemini-Blog/image-Nov-02-2026-05-25-08-9163-AM.jpeg)](https://blog.blazingcdn.com/en-us/the-impact-of-cdns-on-global-internet-traffic?hsLang=en)

Learn

### [How CDNs Shape Global Internet Traffic: The Data in 2026](https://blog.blazingcdn.com/en-us/the-impact-of-cdns-on-global-internet-traffic?hsLang=en)

Public measurements say the majority of global internet traffic now leaves a cache, not an origin. A widely ...

Nov 2, 2026, 6:27:11 AM [Read more](https://blog.blazingcdn.com/en-us/the-impact-of-cdns-on-global-internet-traffic?hsLang=en)

[![](https://blog.blazingcdn.com/hubfs/Gemini-Blog/image-Nov-02-2026-04-55-13-2883-AM.jpeg)](https://blog.blazingcdn.com/en-us/how-5g-is-revolutionizing-software-downloads?hsLang=en)

Learn

### [How 5G Changes Software Downloads and Update Delivery](https://blog.blazingcdn.com/en-us/how-5g-is-revolutionizing-software-downloads?hsLang=en)

Public crowdsourced speed tests from 2024 and 2025 put median 5G download speeds in mature markets at roughly ...

Nov 2, 2026, 5:57:25 AM [Read more](https://blog.blazingcdn.com/en-us/how-5g-is-revolutionizing-software-downloads?hsLang=en)

[![](https://blog.blazingcdn.com/hubfs/Gemini-Blog/image-Nov-02-2026-04-25-12-9280-AM.jpeg)](https://blog.blazingcdn.com/en-us/top-cdn-providers-2025-an-expert-guide-to-types-technologies-and-performance-0?hsLang=en)

Compare

### [11 Best CDN Providers in 2026, Tested for Speed, Price and Reach](https://blog.blazingcdn.com/en-us/top-cdn-providers-2025-an-expert-guide-to-types-technologies-and-performance-0?hsLang=en)

The best CDN providers in 2026 split into two leagues. Platform CDNs (Cloudflare, Akamai, Fastly, Amazon ...

Nov 2, 2026, 5:27:36 AM [Read more](https://blog.blazingcdn.com/en-us/top-cdn-providers-2025-an-expert-guide-to-types-technologies-and-performance-0?hsLang=en)

[![](https://blog.blazingcdn.com/hubfs/Gemini-Blog/image-Nov-02-2026-03-55-15-0137-AM.jpeg)](https://blog.blazingcdn.com/en-us/bunny-cdn-review-2025-performance-startup-budget?hsLang=en)

Pricing - Pricing & Costs

### [Bunny.net CDN Review 2026: Speed, Pricing and Limits Tested](https://blog.blazingcdn.com/en-us/bunny-cdn-review-2025-performance-startup-budget?hsLang=en)

Evaluated November 2026, with list prices as checked August 2026: Bunny.net remains one of the cheapest ...

Nov 2, 2026, 4:58:28 AM [Read more](https://blog.blazingcdn.com/en-us/bunny-cdn-review-2025-performance-startup-budget?hsLang=en)

[![](https://blog.blazingcdn.com/hubfs/Gemini-Blog/image-Nov-02-2026-03-45-35-5523-AM.jpeg)](https://blog.blazingcdn.com/en-us/cache-control-max-age-vs-s-maxage-browser-and-cdn-ttls?hsLang=en)

Learn

### [Cache-Control max-age vs s-maxage: Browser and CDN TTLs](https://blog.blazingcdn.com/en-us/cache-control-max-age-vs-s-maxage-browser-and-cdn-ttls?hsLang=en)

Verdict, evaluated November 2026: set max-age for the browser and s-maxage for the CDN, and keep them ...

Nov 2, 2026, 4:48:18 AM [Read more](https://blog.blazingcdn.com/en-us/cache-control-max-age-vs-s-maxage-browser-and-cdn-ttls?hsLang=en)

[![](https://blog.blazingcdn.com/hubfs/Gemini-Blog/image-Nov-02-2026-03-25-13-8673-AM.jpeg)](https://blog.blazingcdn.com/en-us/bunny-net-vs-blazingcdn-cost-efficient-cdn-face-off?hsLang=en)

Pricing - Pricing & Costs

### [Bunny.net vs BlazingCDN in 2026: Which CDN Saves You More](https://blog.blazingcdn.com/en-us/bunny-net-vs-blazingcdn-cost-efficient-cdn-face-off?hsLang=en)

At 100 TB a month, BlazingCDN costs $415 while bunny.net costs $500 on its Volume network or $1,000 on its ...

Nov 2, 2026, 4:28:02 AM [Read more](https://blog.blazingcdn.com/en-us/bunny-net-vs-blazingcdn-cost-efficient-cdn-face-off?hsLang=en)

[![BlazingCDN](https://blog.blazingcdn.com/hubfs/Logo/blog-logo-w.png)](https://blog.blazingcdn.com?hsLang=en)

[📘 Learn](https://blog.blazingcdn.com/cdn-learn?hsLang=en) [📊 Benchmarks](https://blog.blazingcdn.com/cdn-ratings-and-benchmarks?hsLang=en) [🎬 Video & Streaming](https://blog.blazingcdn.com/video-streaming-cdn?hsLang=en) [🏭 Industries](https://blog.blazingcdn.com/cdn-industry-insights?hsLang=en) [💰 Pricing & Costs](https://blog.blazingcdn.com/cdn-pricing-and-cdn-costs?hsLang=en) [⚡ Compare](https://blog.blazingcdn.com/cdn-comparison?hsLang=en) [🔒 Security](https://blog.blazingcdn.com/cdn-security?hsLang=en) [🛠️ Tools](https://blog.blazingcdn.com/cdn-tools?hsLang=en) [✍️ Publish with us](https://blog.blazingcdn.com/publish-with-us?hsLang=en)

[in](https://www.linkedin.com/company/68261278) [𝕏](https://x.com/BlazingCdn) [✉](mailto:marketing@blazingcdn.com)

 Copyright © BlazingCDN |. All rights reserved.

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