Design a Content Delivery Network (CDN)

Medium

Design a content delivery network that caches and serves static content to users around the world with low latency.

Functional Requirements

• Cache and serve static assets (images, JS, CSS)
• Serve content from edge locations nearest to users
• Update or invalidate cache on content change

Non-Functional Requirements

• Serve content in <100ms globally
• Support auto-scaling based on load
• 99.999% uptime and high fault tolerance