Supabase Realtime WebSocket connections silently fail through proxy

[shareefmx]

Describe the bug
Cloudflare Workers cannot tunnel WebSocket connections using a standard fetch() forward. When a client sends Upgrade: websocket, the Worker silently drops the upgrade. Supabase Realtime appears to connect but never receives any events.

Steps to reproduce

1. Set up JioBase proxy
2. Use Supabase Realtime (supabase.channel(...).subscribe()) via the proxy URL
3. Observe: connection appears established but no events are received

Expected behavior
WebSocket connections should be properly tunnelled to Supabase.

Suggested fix

if (request.headers.get('Upgrade') === 'websocket') {
  const [client, worker] = Object.values(new WebSocketPair());
  // pair with upstream WebSocket
}

Environment

• apps/proxy/src/index.ts
• Supabase Realtime / WebSocket