Anthony Giretti • 1/3/2026

ASP.NET Core 10: First-class Server-Sent Events with an Angular client

This article explores the new first-class Server-Sent Events (SSE) support in ASP.NET Core 10, using the TypedResults.ServerSentEvents API and SseItem<T> from System.Net.ServerSentEvents. It compares SSE with SignalR and polling, highlighting SSE's simplicity for unidirectional data streams like notifications and progress updates. The tutorial includes a complete backend example streaming Country events via SSE and an Angular client consuming them with the native EventSource API. It covers the model, DbContext, and service implementation.

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#streaming #angular #Server Sent Events