Engineering: Server-Sent Events vs WebSockets

Unidirectional vs Bidirectional

A user asks a question, the server streams the answer. The data flows fundamentally in one direction until exhaustion. A full multiplex WebSockets implementation presents immense state management overhead for purely unidirectional streams.

• SSE leverages standard HTTP protocols automatically supporting corporate proxy routing.
• It elegantly resolves the 'Chunked Transfer Encoding' format required for rolling Markdown.
• Eliminates the handshake latency and Ping/Pong heartbeat requirements of generic WS engines.