⚡ Web EngineeringUpdated: September 2, 2026
WebSockets & Server-Sent Events (SSE): Real-Time Bi-Directional vs. Unidirectional Streaming
By Moemecto Distributed Systems & Software Architecture Group
Architecting real-time applications: full-duplex TCP WebSockets vs. lightweight HTTP/2 SSE streaming for LLM tokens, live notifications, and market data feeds.
Real-time streaming architectures require selecting between bidirectional full-duplex WebSocket connections and lightweight, HTTP-native Server-Sent Events (SSE).
1. WebSockets vs. Server-Sent Events (SSE)
| Dimension | WebSockets (`ws://`) | Server-Sent Events (`text/event-stream`) |
|---|---|---|
| Directionality | Full-duplex bidirectional (Client & Server) | Unidirectional (Server-to-Client only) |
| Transport Protocol | Dedicated TCP connection upgrade | Standard HTTP/1.1 or HTTP/2 connection |
| Reconnection & Event IDs | Manual client-side implementation required | Native automatic browser reconnection |
| Best Suited Use Case | Multiplayer gaming, collaborative canvas | LLM token streaming, live dashboards |
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Moemecto Distributed Systems & Software Architecture Group
Our engineering practice specializes in Domain-Driven Design (DDD), high-throughput message streaming with Apache Kafka, low-level C/C++ embedded IoT firmware, and Zero-Downtime continuous release pipelines.
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