edge-computing

Edge computing reduces latency by pushing logic closer to users via Cloudflare Workers. You optimize performance by writing edge functions for request handling, using streaming, and applying cache-coalescing strategies to lower TTFB from the user perspective.

Configure CDN cache headers by setting Cache-Control directives and designing proper cache keys. To prevent cache poisoning, apply correct Vary header rules and cache-key design to avoid serving stale or mixed content across different user requests.

Cache invalidation for edge functions is handled using surrogate keys or cache tags. This allows you to selectively purge cached content across CDN tiers without clearing the entire cache, maintaining high hit rates while ensuring content freshness.

Geo-routing with serverless at the edge routes users based on their geographic location. By deploying edge functions across global CDN points of presence, requests are automatically directed to the nearest edge node for lower latency.

Edge computing supports state management through edge storage options like KV and Durable Objects. You use KV for eventual consistency and Durable Objects for strongly consistent state, including rate limiting and fail-open error handling.

CDN caching serves stale content when cache tier configurations and cache key rules are mismatched. Proper cache invalidation requires configuring surrogate keys and verifying your cache-control headers align with the edge runtime's caching behavior.