Protocols

Transport Protocols

Understanding SOCKJS transport fallback mechanism

1How Transports Work

SOCKJS automatically selects the best available transport based on browser capabilities and network conditions.

WebSocket - Full-duplex, lowest latency

XHR Streaming - Server-sent events over XHR

XHR Polling - Long-polling fallback

JSONP Polling - Cross-domain fallback

javascript

const sock = new SockJS(url, null, {
  transports: ['websocket', 'xhr-streaming', 'xhr-polling']
});

javascript

sock.onopen = function() {
  console.log('Transport:', sock.transport);
};