Cache-aside without an invalidation story ships stale pricing to 2% of users—the hardest 2% to debug. This guide layers CloudFront, ElastiCache, and DAX with TTL, event-driven purge, and when write-through beats cache-aside.
Packet loss on mobile networks still punishes HTTP/1.1 head-of-line blocking—but HTTP/3 only helps if CloudFront terminates QUIC and your origin connection pools are sized for multiplexed streams. This guide connects Reno, Cubic, BBR, HPACK, and QUIC to ALB and CloudFront decisions.
A full TLS handshake on every API call adds RTTs your p99 cannot afford. This guide walks TLS 1.3 1-RTT resumption, ACM cert rotation, and security policies on ALB and CloudFront.
Global Accelerator charges about $0.025 per provisioned accelerator per hour—even while disabled—and adds Data Transfer-Premium on top of normal data transfer. Two static Anycast IPv4 addresses (or four addresses in dual-stack: two IPv4 and two IPv6) front ALBs, NLBs, EC2, or EIPs across Regions; that pricing model changes whether you beat CloudFront or Route 53 latency records alone.
Data transfer is the most consistently underestimated cost in AWS architectures. It does not appear in compute estimates, it does not scale linearly, and it punishes microservices designs at exactly the moment growth feels like success.
A retail company saw their AWS bill spike $90k in November. The culprit: three data transfer mistakes that compound during peak traffic. Here is the full teardown.
AWS WAF blocks attacks. It also blocks legitimate users when the rules are wrong — and that's a worse incident. Managed rule groups, custom rules, rate limiting, bot control, and the layered defense strategy that protects without flooding your support queue.
