Web & SaaS
What is WebSocket?
Definition
A protocol enabling a persistent, bidirectional connection between client and server — essential for real-time features like live chat, AI voice pipelines, and streaming data.
In more detail
Standard HTTP is request-response: the client sends a request, the server responds, the connection closes. WebSocket upgrades that connection to stay open — allowing either side to send messages at any time without a new request. This bidirectional, persistent channel is what enables genuinely real-time applications.
Common use cases: live chat and messaging, real-time notifications, collaborative editing (Google Docs-style), live data feeds (stock prices, sports scores), and — critically for AI voice — streaming audio pipelines where speech must flow continuously in both directions simultaneously.
WebSocket connections start with an HTTP handshake (`Upgrade: websocket` header) and then switch protocols. Most modern frameworks support WebSocket natively — Next.js via custom server, FastAPI via Starlette, Node.js via ws or Socket.io. Cloud platforms like Vercel have edge-level WebSocket support.
Why it matters
Any real-time feature requires either WebSockets, Server-Sent Events (SSE), or long-polling. WebSocket is the right choice when data flows in both directions — chat, collaboration, and voice AI all require it. Choosing SSE or polling when WebSocket is needed creates artificial latency and scalability problems.
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