How do you understand real customer preferences and behaviors before your competition does? A/B testing offers a proven method. It allows you to experiment with serving different versions of your content, and then gauging their relative effectiveness. However, it typically requires a trip to the origin server to make the A/B decision regarding which piece of content to serve to the end user. This typically reduces cacheability. The long backhaul also results in reduced offload and added latency to the end-user request.