WebRTC & WebSockets Cheat Sheet
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This content was generated with the assistance of AI and should be verified against the official documentation before being relied on in production. See the section bibliography for the reference material consulted while preparing these pages. |
A single-page, colour-coded summary of the WebRTC and WebSockets essentials — a transport chooser, the WebSocket
handshake, frame header and close codes, the browser API, reconnection and heartbeats, one strip per server stack, the
WebRTC offer and answer sequence, perfect negotiation, media constraints, data-channel options, simulcast, getStats,
mesh versus SFU versus MCU, TURN credentials, media servers, XMPP essentials, chat, videoconference and game
checklists, production settings, and a strip of what changed since older tutorials — handy for quick memorization or
as a printable desk reference through the downloadable PDF. It reflects
the baseline of the section as checked on 2026-10-24: RFC 6455 with RFC 8441 and RFC 9220, the W3C WebRTC 1.0
Recommendation with JSEP in RFC 9429, mediasoup 3.31.0, LiveKit 1.13.10, Janus 1.4.3, socket.io 4.8.4, python-socketio
5.17.0, uWebSockets.js v20.71.0, Channels 4.3.2, ASP.NET Core 10.0.13, Spring Framework 7.0.10, Atmosphere 4.0.76, Swoole
6.2.3, Laravel Reverb 1.12.0, ejabberd 26.09 and Prosody 13.0.7. The section home page is
WebRTC & WebSockets.
For the full explanation, every argument, and additional examples, see the dedicated pages:
Foundations — Real-Time Web Overview, Networking Fundamentals, The WebSocket Protocol, The Browser WebSocket API, Server-Sent Events and Long Polling, Message Design and Serialization, Connection Lifecycle, Heartbeats and Reconnection, and WebTransport and Media over QUIC.
WebSocket servers — Choosing a WebSocket Stack, Socket.IO (Node.js), Socket.IO Protocol and Clients, python-socketio, uWebSockets.js, Django Channels, SignalR, Spring WebFlux WebSockets, Atmosphere, Swoole, and Laravel Reverb.
WebRTC basics — WebRTC Architecture, Media Capture and Devices, Screen Sharing, Peer Connections and SDP, Signaling and Perfect Negotiation, ICE, STUN and TURN, and Data Channels.
Media quality and security — Codecs, Simulcast and SVC, Stats, Quality and Bandwidth, Recording and Media Processing, and End-to-End Encryption.
Topologies and media servers — Topologies: Mesh, SFU and MCU, mediasoup, LiveKit, Janus and Jitsi, Pion and aiortc, and WHIP, WHEP and Live Streaming.
XMPP — XMPP Fundamentals, XMPP Servers, XMPP in the Browser, XMPP Chat Features, Converse.js, OMEMO Encryption, and Jingle Calls and Jitsi.
Chat — Chat Architecture, Presence, Typing and Receipts, History, Offline Delivery and Moderation, and Building a Chat App.
Videoconference — Videoconference Architecture and Building a Videoconference App.
Multiplayer games — Multiplayer Game Architecture, Latency Compensation, Game Servers and Colyseus, and Building a Multiplayer Game.
Production — Authentication and Authorization, Security, Scaling WebSockets, Proxies, Load Balancers and Deployment, Scaling WebRTC and TURN, Observability, Testing Real-Time Apps, Load Testing and Capacity Planning, and Mobile and Native Clients.
Reference — Comparison & Decision Guide.