cloudfront

CloudFront cache behaviors route requests to S3, ALB, or API Gateway origins based on path patterns. You configure origins and cache behaviors to optimize content delivery by specifying TTLs, allowed HTTP methods, and forwarding rules for each origin type.

Lambda@Edge and CloudFront Functions execute custom code at edge locations to modify HTTP request and response headers. You attach these functions to cache behaviors to inject headers, rewrite URLs, or perform authentication before traffic reaches your origin.

Securing CloudFront content delivery involves integrating AWS WAF to filter malicious traffic and using signed URLs or signed cookies to restrict access. WAF enforces security postures at the edge, while signed URLs authorize specific users to access protected content.

CloudFront cache misses and high origin latency often stem from misconfigured cache behaviors, improper TTL settings, or forwarded headers that reduce cache efficiency. Troubleshoot by reviewing cache policies and origin response times to tune performance and increase cache hit ratios.

CloudFront supports API backends by routing dynamic requests through API Gateway or ALB origins. You optimize dynamic API responses by configuring cache behaviors to forward all required headers and disable caching for POST requests, ensuring accurate API execution.

You can deploy a ready-to-use CloudFront configuration for web applications that includes S3 origins, cache behaviors, and WAF integration. This configuration accelerates content delivery and secures public endpoints by applying web ACLs and security headers automatically.