REST APIs vs Webhooks Explained: Why Modern Systems Need Event-Driven Architecture
Learn the real difference between REST APIs and webhooks, why polling fails at scale, and how event-driven integrations power real-time modern applications.
Modern software systems depend heavily on APIs to move information between different services.
Over the past decade, REST APIs have become the most common way developers build distributed systems.
They are simple to understand, stateless by design, and follow a clear request and response pattern. Because of that, they work well for a wide range of applications.
In a typical REST setup, the client has to ask the server for information. The client sends a request, and the server responds with data. When the client wants to know if something has changed, it has to ask again.
This pattern is called polling. An application keeps sending requests at regular intervals just to check if new data is available.
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Polling works fine in many situations, but it starts to break down when systems need to react to events right away.
As systems grow and more services begin talking to each other, this limitation becomes more obvious. REST works best when the client knows exactly when it needs information.
It does not work as well when the server needs to notify the client that something has happened. That is where webhooks come in.
In this article, I’ll look at why REST by itself is often not enough for modern integrations, how webhooks solve a completely different kind of problem, and when they should be used in real systems.
Along the way, I’ll walk through practical Python examples and real world scenarios that make the difference between these two approaches much easier to understand.
Learning this distinction is an important step toward understanding event driven architecture.
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