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$ curl repovive.com/roadmaps/system-design-interview-prep/networking-apis/websockets

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$ curl repovive.com/roadmaps/system-design-interview-prep/networking-apis/websockets

Repovive

WebSockets - Networking & APIs | System Design Interview Prep | Repovive

Repovive.

System Design Interview Prep22 sections · 691 units23h total

Open in Course

WebSockets

Bidirectional communication

WebSockets enable full-duplex communication over a single TCP connection:

Handshake: Starts as HTTP, upgrades to WebSocket

GET /chat HTTP/1.1
Upgrade: websocket
Connection: Upgrade

Use cases:

Real-time chat
Live notifications
Collaborative editing
Gaming
Live dashboards

Trade-offs:

Persistent connections (more server resources)
Harder to scale (sticky sessions or pub/sub)
Not cacheable

Use WebSockets when you need real-time, bidirectional communication.