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How to Test & Monitor GitHub Webhooks in 2026

Complete guide to testing, debugging, and monitoring GitHub webhooks. Auto-detect push, PR, and issue events with signature verification and failure diagnosis.

Setup

Step 1: Create a free account at webhook.sdnbros.app
Step 2: Copy your webhook URL from the dashboard
Step 3: In your GitHub repo → Settings → Webhooks → Add webhook
Step 4: Set Payload URL to your webhook URL, Content type to application/json
Step 5: Push a commit — the push event appears classified in real-time

Test with curl

curl -X POST https://webhook.sdnbros.app/p/YOUR_TOKEN \
  -H "Content-Type: application/json" \
  -H "X-GitHub-Event: push" \
  -H "X-GitHub-Delivery: test-123" \
  -d '{"ref":"refs/heads/main","repository":{"full_name":"yourorg/yourrepo"}}'

Supported Event Types

SDNBros auto-detects these GitHub events:

push pull_request issues issue_comment create delete release workflow_run check_run check_suite deployment deployment_status

Common Errors & How to Fix Them

Error	Cause	Fix
`HTTP 401`	X-Hub-Signature-256 verification failing	Ensure your webhook secret matches between GitHub and SDNBros
`Timeout`	GitHub has a 10-second timeout for webhook delivery	Return 200 immediately, process the event asynchronously
`No events received`	Wrong content type or events not selected	Set Content-Type to application/json and select the events you need

Why Use SDNBros for GitHub Webhooks?

Auto-classification: We detect GitHub webhooks by signature headers — zero configuration
Root-cause diagnosis: When a delivery fails, we tell you exactly why (timeout, auth error, server crash) with GitHub-specific context
Replay safety: Know if it's safe to replay a failed event before you click the button
Operational visibility: Public service and network status telemetry
CLI tunnel: sdnbros webhook tunnel --port 3000 forwards webhooks to localhost

Start monitoring GitHub webhooks for free

Create an endpoint and evaluate auto-classification, diagnosis, and replay.

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