Azure Web PubSub
Azure Web PubSub enables you to build real-time messaging web applications using WebSockets and the publish-subscribe pattern. Any platform supporting WebSocket APIs can connect to the service easily, e.g. web pages, mobile applications, edge devices, etc. The service manages the WebSocket connections for you and allows up to 100K concurrent connections. It provides powerful APIs for you to manage these clients and deliver real-time messages.
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- Publish messages to WebSocket connections
- Create a chat app
- Using PubSub WebSocket subprotocol
Integrate with Azure Function
Here contains the details.