Frontend Engineers Should Care More About Infrastructure

One 304 Not Modified is easy to ignore. A page full of them is latency. We migrated CDN providers that quarter. The new provider was meaningfully cheaper, and its edge coverage in Southeast Asia looked comparable. The migration itself went smoothly. Traffic moved over, error rates stayed normal, and the infra team signed it off. One thing had changed underneath us: the Cache-Control headers our old provider had been injecting at the edge did not carry over. Before that migration, I did not think