fix(readme): update

readme.websocket-keepalive-fix.md

@@ -1,63 +0,0 @@
-# WebSocket Keep-Alive Fix for SNI Passthrough
-
-## Problem
-
-WebSocket connections in SNI passthrough mode are being disconnected every 30 seconds due to:
-
-1. **WebSocket Heartbeat**: The HTTP proxy's WebSocket handler performs heartbeat checks every 30 seconds using ping/pong frames. In SNI passthrough mode, these frames can't be injected into the encrypted stream, causing connections to be marked as inactive and terminated.
-
-2. **Half-Zombie Detection**: The connection manager's aggressive cleanup gives only 30 seconds grace period for connections where one socket is destroyed.
-
-## Solution
-
-For SNI passthrough connections:
-1. Disable WebSocket-specific heartbeat checking (they're handled as raw TCP)
-2. Rely on TCP keepalive settings instead
-3. Increase grace period for encrypted connections
-
-## Current Settings
-
-- Default inactivity timeout: 4 hours (14400000 ms)
-- Keep-alive multiplier for extended mode: 6x (24 hours)
-- WebSocket heartbeat interval: 30 seconds (problem!)
-- Half-zombie grace period: 30 seconds (too aggressive)
-
-## Recommended Configuration
-
-```typescript
-const proxy = new SmartProxy({
-  // Increase grace period for connection cleanup
-  inactivityTimeout: 14400000, // 4 hours default
-  keepAliveTreatment: 'extended', // or 'immortal' for no timeout
-  keepAliveInactivityMultiplier: 10, // 40 hours for keepalive connections
-  
-  // For routes with WebSocket over SNI passthrough
-  routes: [
-    {
-      name: 'websocket-passthrough',
-      match: { ports: 443, domains: 'ws.example.com' },
-      action: {
-        type: 'forward',
-        target: { host: 'backend', port: 443 },
-        tls: { mode: 'passthrough' },
-        // No WebSocket-specific config needed for passthrough
-      }
-    }
-  ]
-});
-```
-
-## Temporary Workaround
-
-Until a fix is implemented, you can:
-
-1. Use `keepAliveTreatment: 'immortal'` to disable timeout-based cleanup
-2. Increase the half-zombie grace period
-3. Use TCP keepalive at the OS level
-
-## Proper Fix Implementation
-
-1. Detect when a connection is SNI passthrough
-2. Skip WebSocket heartbeat for passthrough connections 
-3. Increase grace period for encrypted connections
-4. Rely on TCP keepalive instead of application-level ping/pong