WebSockets Bring Light at the End of the Tunnel
summary
Explains how WebSockets create a persistent full‑duplex tunnel so a Node server can push JSON to many clients with millisecond latency using socket.io (falls back to long‑polling). Shows three concrete builds: a global click counter aggregated on the server, a multiuser chat room, and a live Twitter feed demo; also a file‑processing job that streams percentage progress for hours. Notes benefits (reduced bandwidth, presence) and costs (no HTTP caching, architectural changes required).
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