WebSocket

WebSocket is a communication protocol that starts as an HTTP request and upgrades into a long-lived, full-duplex connection, so either side can send messages at any time. URLs use the ws:// or secure wss:// scheme.

Why it matters

Chat, live dashboards, multiplayer games and notifications need low-latency updates, and polling with repeated requests wastes bandwidth. Long-lived connections create operational demands, though: proxies and load balancers must support the upgrade and have suitable idle timeouts, and each open connection uses server memory. Monitoring should include a test that actually opens the connection, not just a check that the homepage returns 200.

Example

const ws = new WebSocket('wss://example.com/live');
ws.onmessage = (e) => console.log('update:', e.data);
ws.onopen = () => ws.send('subscribe:orders');

The handshake response is status 101 Switching Protocols.

Common mistakes

• Using plain ws:// on an HTTPS page, which browsers block as mixed content.
• Not sending periodic pings, so idle proxies close the connection.
• Forgetting reconnection logic with backoff.

Related

• AJAX
• Keep-alive
• Reverse proxy
• Load balancer
• टूल: Port checker

यह पेज सामान्य जानकारी है, जिसे हमारी संपादकीय टीम ने लिखा है और दस्तावेज़ीकरण बदलने पर अपडेट किया जाता है। सर्वर और प्रदाता अलग-अलग होते हैं, इसलिए बदलाव पहले सुरक्षित तरीके से जाँचें। देखें: संपादकीय नीति और अस्वीकरण.