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Realtime (WebSockets / SSE / WebRTC)

Realtime web techniques: WebSocket protocol, Server-Sent Events, WebRTC peer connections, scaling, reconnection, presence, CRDTs, and managed realtime services.

Realtime (WebSockets / SSE / WebRTC)

WebSocket vs HTTP polling

WebSocket upgrade handshake

Server-Sent Events (SSE)

WebSocket vs SSE

Browser WebSocket API basics

Socket.IO vs raw WebSocket

WebSocket framing & message size

Heartbeats & idle timeouts

Reconnection & exponential backoff

Authenticating WebSockets

Scaling WebSockets across servers

WebSocket security

Pub/sub, presence & typing indicators

Managed realtime services

Backpressure & message ordering

WebRTC overview

Supabase Realtime & Postgres CDC

HTTP/2 push, HTTP/3 streaming

Realtime collaboration: CRDTs vs OT

Integrating WebSockets with React Query / SWR