What is the best way to detect websocket support using Javascript?

Question

I\'m trying to use Javascript to detect if a web browser supports websockets, but using only feature-based detection, I\'m getting false positives, so I added a user agent t

Answer 1

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In year 2016 cutting the mustard for modern WebSockets implementation (no prefixes such as MozWebSocket) would be

if (
  'WebSocket' in window && window.WebSocket.CLOSING === 2
) {
 // supported
}

http://www.w3.org/TR/websockets/#the-websocket-interface