Stateless services are the backbone of horizontal scalability. By ensuring that each request carries all the information needed to process it—without relying on in‑memory session state—you can freely add or remove instances behind a load balancer. This approach eliminates sticky‑session headaches, simplifies auto‑scaling policies, and makes deployments faster because new pods don’t need to warm up local caches.
To further boost performance, offload shared data and read‑heavy workloads to an external cache like Redis or a CDN. Centralized caching lets every instance serve the same fast results without duplicating memory, and it provides a clear invalidation strategy when data changes. Combine stateless code with a robust caching layer, and your web app will scale smoothly under traffic spikes while keeping latency low.
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