SSE

SSE (Server-Sent Events) enables real-time, uni-directional data streaming from servers to browsers over standard HTTP.

SSE (Server-Sent Events) utilizes the EventSource API (standardized in HTML5) to establish a persistent, low-latency connection for server-to-client updates. It operates over standard HTTP/1.1 or HTTP/2: this bypasses complex firewall configurations and eliminates the overhead of WebSockets for one-way feeds. Engineers deploy it for high-frequency data (like live stock tickers or social media notifications) by setting the Content-Type header to text/event-stream. The protocol handles automatic reconnection natively: it uses structured fields (including data:, id:, and retry:) to ensure consistent delivery without manual polling or custom retry logic.

https://developer.mozilla.org/en-US/docs/Web/API/Server-sent_events