O que é uma CDN?
A CDN (Content Delivery Network) is a geographically distributed network of servers that delivers web content to users from the nearest edge location. CDNs cache static assets (images, CSS, JavaScript) close to end users, reducing latency and improving load times.
Como Funciona
When a user requests a page, the CDN routes them to the nearest edge server (PoP — Point of Presence). If the content is cached there, it's served directly. If not, the edge server fetches it from the origin server, caches it, and serves it. This reduces the distance data travels and offloads traffic from the origin.
Por Que Importa
CDNs dramatically improve website speed for global audiences, reduce bandwidth costs, protect against DDoS attacks, and improve availability. They are essential for any website with international users or high traffic.
Problemas Comuns
- Cache invalidation issues serving stale content
- CDN misconfiguration causing origin overload
- SSL certificate issues at CDN edge nodes
- CORS errors from CDN-served assets