Top Flutter Server-Sent Events (SSE) packages

Last updated: May 18, 2026

Server-Sent Events (SSE) provide a unidirectional stream of data from a server to a client over a standard HTTP connection. It is the perfect protocol for live news feeds, stock tickers, and streaming AI responses.

Best Practices for Server-Sent Events

• SSE vs. WebSockets: Use SSE when you only need to receive continuous data from the server. It is much simpler to scale and firewall-friendly compared to bidirectional WebSockets.
• Automatic Reconnection: If the HTTP connection drops, the client should automatically attempt to reconnect. Ensure your implementation sends the Last-Event-ID so the server can resume the stream without data loss.
• Memory Leaks: Because SSE keeps an HTTP connection open indefinitely, you must explicitly close the connection and cancel the StreamSubscription when the user navigates away from the active screen.

The complete list of Server-Sent Events (SSE) and EventSource packages for Flutter is provided below.