In today’s fast-paced digital world, web applications need to handle requests efficiently, but sometimes duplicate requests slip through, leading to redundant processing, wasted resources, and a degraded user experience. Whether it’s a user double-clicking a button or a system sending repeated requests due to poor network connectivity, handling these duplicates effectively is crucial for maintaining application performance and ensuring accurate data processing. This article will delve into the best practices and techniques for preventing duplicate requests, illustrated with code examples and demos for better understanding. By the end, you'll be equipped with a toolkit to tackle this common issue head-on.