When should I use WebSockets vs polling?
Use WebSockets for real-time features (chat, notifications, live updates, gaming, collaboration) where the server needs to push data instantly. Use polling for simple, low-frequency updates where real-time isn't critical. WebSockets are more efficient for frequent bidirectional communication.
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More FAQs in What Are WebSockets and How They Differ from HTTP Real-Time Communication Guide
WebSockets provide full-duplex, persistent communication between client and server over a single TCP connection. Unlike HTTP's request-response model, WebSockets keep the connection open and allow the server to push data to the client at any time. This is essential for real-time features.
HTTP is request-response (client asks, server responds, connection closes). WebSockets are full-duplex and persistent (connection stays open, both sides can send at any time). HTTP has overhead per request (headers), WebSockets have minimal overhead after the initial handshake.
The client sends an HTTP request with 'Upgrade: websocket' header. The server responds with '101 Switching Protocols'. The connection upgrades from HTTP to WebSocket. After the handshake, both sides can send messages at any time without HTTP overhead.
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