Troubleshooting n8n Webhook Failures with Google Chat: Practical Steps for Devs

This failure pattern often arises because platform-originated requests differ from manual posts in subtle ways: headers, content encoding, verification challenges, timeouts, or the requirement for an immediate HTTP 2xx acknowledgement. Google Chat and other Google APIs can also perform an initial verification handshake or expect a particular response structure, and intermediary networking (load balancers, Cloud Run ingress, corporate firewalls) can block or drop the request.

Start by capturing the raw request traffic. Use a public tunneling tool like ngrok or a controlled proxy in front of your production endpoint to verify whether Google Chat reaches your webhook and what it sends. Check TLS cert validity and that your URL does not redirect. Inspect the exact Content-Type, encoding (chunked vs content-length), and any custom headers Google sends. Confirm whether Google requires a verification token or expects the endpoint to respond within a short timeout window with a specific status code or body.

Next, examine n8n-specific settings. Ensure the webhook node is correctly published, that the workflow's trigger mode matches how the webhook is called, and that any 'Respond to Webhook' node behavior aligns with synchronous vs asynchronous patterns. Review n8n execution logs and system logs for dropped connections or rejected requests. If Google's requests are being dropped before hitting n8n, check cloud ingress rules, API Gateway settings, and any IP-restriction lists.

If the root cause remains unclear, create a minimal reproducible workflow that simply logs incoming headers and body, then iterate. Engage Google Cloud logs to see delivery attempts, and collect the request IDs for support channels. For production reliability, add retries, idempotency keys, and monitoring that alerts when expected webhook traffic stops arriving.