Webhook Handler Not Processing Events
Webhook endpoint receives POST requests (verified in logs) but event handlers don't execute. The webhook returns 200 OK but triggers no side effects. Events are silently dropped with no error indication, making this extremely difficult to debug.
This commonly happens when webhook routing is correct but handlers aren't invoked, or when async processing silently fails.
Error Messages You Might See
Common Causes
- Webhook route defined but handler not actually attached to route
- Event type check fails (comparing event.type to unexpected value)
- Handler throws exception but caught and silently ignored
- Async handler fired but not awaited, task completes after response sent
- Webhook signature verification fails, request rejected before reaching handler
How to Fix It
Add logging at webhook entry point to confirm route hit. Log the event payload to see what's received. Verify signature verification logic. Use try-catch with logging around handler execution. Ensure async operations complete before responding. Return 200 only after handler confirms success. Test with curl: curl -X POST -H 'Content-Type: application/json' -d '{}' http://localhost:8080/webhook
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Get HelpFrequently Asked Questions
Why does webhook return 200 immediately?
It's safe to return 200 after validation but queue async work. Use event queues/background jobs for actual processing. Webhook should just acknowledge receipt.
How to validate webhook signatures?
Provider sends signature header (e.g., X-Signature). Compute HMAC-SHA256(payload, secret), compare to signature. Return 401 if invalid.
How to debug webhook delivery?
Most providers have webhook delivery logs. Check there first to see if request was sent. Add logging to handler to confirm execution.