Server-Sent Events (SSE) Developer Documentation

Server-Sent Events (SSE) is a technology that allows a client to receive real-time updates from a server via HTTP. Unlike traditional HTTP requests, SSE maintains a persistent connection, enabling the server to push data to the client as it becomes available.

Key Features

Unidirectional Communication: Data flows only from server to client
Event Stream Format: Uses text/event-stream MIME type
Automatic Reconnection: Built-in support for reconnecting after disconnection
Cross-Origin Support: Works with CORS policies

Use Cases

Live sports scores 🏀
Stock market updates 📈
Log monitoring 📜
News feeds 📰

Implementation Example

const eventSource = new EventSource('/en/developer_docs/sse_example');  
eventSource.onmessage = function(event) {  
  console.log('Received:', event.data);  
};

Best Practices

Use Content-Type: text/event-stream for event streams
Implement proper heartbeat mechanisms ❤️
Handle connection errors gracefully ⚠️
Use Last-Event-ID for resuming streams 🔁

For more technical details about SSE implementation, visit our SSE API Reference.