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Showing content from https://learn.microsoft.com/en-us/azure/event-grid/namespace-push-delivery-overview below:

Introduction to push delivery in Event Grid namespaces - Azure Event Grid

This article builds on push delivery with HTTP for Event Grid basic and provides essential information before you start using push delivery on Event Grid namespaces over HTTP protocol. This article is suitable for users who need to build applications to react to discrete events using Event Grid namespaces. If you're interested to know more about the difference between the Event Grid basic tier and the standard tier with namespaces, see choose the right Event Grid tier for your solution.

Events published to Event Grid namespaces land on a topic, which is a namespace subresource that logically contains all events. Namespace topics allows you to create subscriptions with flexible consumption modes to push events to a particular destination or pull events at your pace.

Here are the supported event handlers:

• Event Hubs
• Webhooks

Event Grid supports push and pull event delivery using HTTP. With push delivery, you define a destination in an event subscription, a webhook, or an Azure service, to which Event Grid sends events. With pull delivery, subscriber applications connect to Event Grid to consume events. Pull delivery is supported for topics in an Event Grid namespace.

Important

Event Hubs is supported as a destination for subscriptions to namespace topics. In coming releases, Event Grid Namespaces will support all destinations currently available in Event Grid Basic along with additional destinations.

The following are general guidelines to help you decide when to use pull or push delivery.

• You need full control as to when to receive events. For example, your application might not be up all the time, not stable enough, or you process data at certain times.
• You need full control over event consumption. For example, a downstream service or layer in your consumer application has a problem that prevents you from processing events. In that case, the pull delivery API allows the consumer app to release an already read event back to the broker so that it can be delivered later.
• You want to use private links when receiving events, which is possible only with the pull delivery, not the push delivery.
• You don't have the ability to expose an endpoint and use push delivery, but you can connect to Event Grid to consume events.

• You want to avoid constant polling to determine that a system state change has occurred. You rather use Event Grid to send events to you at the time state changes happen.
• You have an application that can't make outbound calls. For example, your organization might be concerned about data exfiltration. However, your application can receive events through a public endpoint.

• Create, view, and manage namespaces
• Quickstart: Publish and subscribe to app events using namespace topics
• Control plane and data plane SDKs
• Quotas and limits

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