Claude Code api

WebSocket Connection Dropped Unexpectedly

Real-time features using WebSocket connections drop unexpectedly. Client loses connection to server with no reconnection attempt. Users experience gaps in real-time updates or are suddenly disconnected.

Connection works initially but doesn't handle network interruptions or server resets gracefully.

Error Messages You Might See

WebSocket closed unexpectedly Connection lost without reconnect Real-time updates stop suddenly
WebSocket closed unexpectedlyConnection lost without reconnectReal-time updates stop suddenly

Common Causes

  1. No heartbeat/ping-pong to keep connection alive
  2. No reconnection logic, drops permanently on disconnection
  3. Server timeout killing idle connections
  4. Network interruption not detected by client
  5. Large messages causing buffer overflow and disconnect

How to Fix It

Implement ping-pong heartbeat: server sends ping every 30s, client responds pong. Implement auto-reconnect with exponential backoff: 1s, 2s, 4s, etc. Set reasonable timeouts. Handle onclose event to trigger reconnect. Queue messages while disconnected, flush on reconnect. Monitor connection state in UI: show 'offline' badge when disconnected.

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Frequently Asked Questions

How to keep WebSocket alive?

Implement ping-pong. Server sends ping frame every 30s. Client responds pong. Resets timeout counter.

How to reconnect automatically?

onclose event triggers reconnect with exponential backoff: setTimeout(() => connect(), delay). Delay grows: 1s, 2s, 4s, etc.

Should messages be queued while offline?

Yes. Store in array while disconnected. On reconnect, flush queue: queue.forEach(msg => send(msg)).

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