How One Retailer Served 2 Million Product Pages During a Major Outage

When a major U.S. retailer experienced a critical outage at their origin layer, 2 million shoppers remained unaffected thanks to Harper, a resilience system that seamlessly took over product page delivery. Harper, engineered to handle such disruptions, managed to serve 40 million pre-rendered pages from cache with minimal latency, ensuring 80% of traffic was preserved during the downtime. The system's architecture, which includes full-page HTML caching and a low-latency design, enabled it to maintain user experience without degraded templates or missing content. Operating across multiple geographically distributed nodes, Harper's smart load balancing handled traffic efficiently, preventing revenue loss and customer frustration for the retailer. This incident underscores the importance of a robust infrastructure that can eliminate reliance on origin systems, illustrating the business value of resilience and prompting other teams to consider similar solutions to safeguard against potential outages.

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