Azure Event Grid Webhooks

When to Use This Skill

• How do I receive Azure Event Grid events at an HTTP endpoint?
• How do I verify an Azure Event Grid webhook? Where is the signature header?
• How do I handle Microsoft.EventGrid.SubscriptionValidationEvent?
• Why is my Event Grid event subscription stuck in AwaitingManualAction or Failed?
• What is WebHook-Request-Origin / WebHook-Allowed-Origin and why is Event Grid sending me an HTTP OPTIONS request?
• How do I authenticate Event Grid deliveries with a custom header, a query-parameter secret, or Microsoft Entra ID?
• How do I parse Microsoft.Storage.BlobCreated from an Event Grid array vs a CloudEvents object?

There Is No Signature — Read This First

Event Grid is a managed pub/sub broker, not a single-vendor webhook signer.