There are many use cases where additional processing happens after the main request handling is complete, typically in web servers, APIs, or distributed systems:
For example -
Logging - Record request/response data after handling
Analytics - Send metrics to Prometheus, Datadog, etc.
Security Auditing - Capture actions for regulatory compliance
Asynchronous Notification - Trigger follow-up actions in background like publlishing messages to Message Queues like Kafka.
Resource Cleanup - Clean up resources related to request