Which statement best describes a webhook?

Which statement best describes a webhook?

• A. A polling-based data retrieval mechanism
• B. A user-defined HTTP callback or push API that is raised when an event occurs
• C. A server-side API for static content delivery
• D. A serialization format for events

Answer: (B)

Webhooks are event-driven HTTP callbacks. In this model, one service registers an HTTP endpoint with another service and, when a specified event happens, the source service automatically sends (pushes) the event data to that endpoint. This is a push mechanism: instead of you polling for updates, the system notifies you as soon as something occurs. It’s not about retrieving static content via an API, nor about a data serialization format—the key idea is the automatic HTTP notification that carries the event payload to your configured URL. For practical use, the payload is often JSON and is typically secured with a signature or secret so you can verify the data origin and integrity.

Webhooks are event-driven HTTP callbacks. In this model, one service registers an HTTP endpoint with another service and, when a specified event happens, the source service automatically sends (pushes) the event data to that endpoint. This is a push mechanism: instead of you polling for updates, the system notifies you as soon as something occurs. It’s not about retrieving static content via an API, nor about a data serialization format—the key idea is the automatic HTTP notification that carries the event payload to your configured URL. For practical use, the payload is often JSON and is typically secured with a signature or secret so you can verify the data origin and integrity.