fix(readme): update

readme.md

@@ -665,6 +665,661 @@ redirect: {
 }
 ```
 
+## Forwarding Modes Guide
+
+This section provides a comprehensive reference for all forwarding modes available in SmartProxy, helping you choose the right configuration for your use case.
+
+### Visual Overview
+
+```mermaid
+graph TD
+    A[Incoming Traffic] --> B{Action Type?}
+    
+    B -->|forward| C{TLS Mode?}
+    B -->|socket-handler| D[Custom Handler]
+    
+    C -->|terminate| E[Decrypt TLS]
+    C -->|passthrough| F[Forward Encrypted]
+    C -->|terminate-and-reencrypt| G[Decrypt & Re-encrypt]
+    C -->|none/HTTP| H[Forward HTTP]
+    
+    E --> I{Engine?}
+    F --> I
+    G --> I
+    H --> I
+    
+    I -->|node| J[Node.js Processing]
+    I -->|nftables| K[Kernel NAT]
+    
+    J --> L[Backend]
+    K --> L
+    D --> M[Custom Logic]
+    
+    style B fill:#f9f,stroke:#333,stroke-width:2px
+    style C fill:#bbf,stroke:#333,stroke-width:2px
+    style I fill:#bfb,stroke:#333,stroke-width:2px
+```
+
+### Overview
+
+SmartProxy offers flexible traffic forwarding through combinations of:
+- **Action Types**: How to handle matched traffic
+- **TLS Modes**: How to handle HTTPS/TLS connections
+- **Forwarding Engines**: Where packet processing occurs
+
+### Quick Reference
+
+#### Modern Route-Based Configuration
+
+| Use Case | Action Type | TLS Mode | Engine | Performance | Security |
+|----------|------------|----------|---------|-------------|----------|
+| HTTP web server | `forward` | N/A | `node` | Good | Basic |
+| HTTPS web server (inspect traffic) | `forward` | `terminate` | `node` | Good | Full inspection |
+| HTTPS passthrough (no inspection) | `forward` | `passthrough` | `node` | Better | End-to-end encryption |
+| HTTPS gateway (re-encrypt to backend) | `forward` | `terminate-and-reencrypt` | `node` | Moderate | Full control |
+| High-performance TCP forwarding | `forward` | `passthrough` | `nftables` | Excellent | Basic |
+| Custom protocol handling | `socket-handler` | N/A | `node` | Varies | Custom |
+
+#### Legacy Forwarding Types (Deprecated)
+
+| Legacy Type | Modern Equivalent |
+|------------|------------------|
+| `http-only` | `action.type: 'forward'` with port 80 |
+| `https-passthrough` | `action.type: 'forward'` + `tls.mode: 'passthrough'` |
+| `https-terminate-to-http` | `action.type: 'forward'` + `tls.mode: 'terminate'` |
+| `https-terminate-to-https` | `action.type: 'forward'` + `tls.mode: 'terminate-and-reencrypt'` |
+
+### Forwarding Mode Categories
+
+#### 1. Action Types
+
+##### Forward Action
+Routes traffic to a backend server. This is the most common action type.
+
+```typescript
+{
+  action: {
+    type: 'forward',
+    target: {
+      host: 'backend-server',
+      port: 8080
+    }
+  }
+}
+```
+
+##### Socket Handler Action
+Provides custom handling for any TCP protocol. Used for specialized protocols or custom logic.
+
+```typescript
+{
+  action: {
+    type: 'socket-handler',
+    socketHandler: async (socket, context) => {
+      // Custom protocol implementation
+    }
+  }
+}
+```
+
+#### 2. TLS Modes (for Forward Action)
+
+##### Passthrough Mode
+- **What**: Forwards encrypted TLS traffic without decryption
+- **When**: Backend handles its own TLS termination
+- **Pros**: Maximum performance, true end-to-end encryption
+- **Cons**: Cannot inspect or modify HTTPS traffic
+
+```mermaid
+graph LR
+    Client -->|TLS| SmartProxy
+    SmartProxy -->|TLS| Backend
+    style SmartProxy fill:#f9f,stroke:#333,stroke-width:2px
+```
+
+##### Terminate Mode
+- **What**: Decrypts TLS, forwards as plain HTTP
+- **When**: Backend doesn't support HTTPS or you need to inspect traffic
+- **Pros**: Can modify headers, inspect content, add security headers
+- **Cons**: Backend connection is unencrypted
+
+```mermaid
+graph LR
+    Client -->|TLS| SmartProxy
+    SmartProxy -->|HTTP| Backend
+    style SmartProxy fill:#f9f,stroke:#333,stroke-width:2px
+```
+
+##### Terminate-and-Reencrypt Mode
+- **What**: Decrypts TLS, then creates new TLS connection to backend
+- **When**: Need traffic inspection but backend requires HTTPS
+- **Pros**: Full control while maintaining backend security
+- **Cons**: Higher CPU usage, increased latency
+
+```mermaid
+graph LR
+    Client -->|TLS| SmartProxy
+    SmartProxy -->|New TLS| Backend
+    style SmartProxy fill:#f9f,stroke:#333,stroke-width:2px
+```
+
+#### 3. Forwarding Engines
+
+##### Node.js Engine (Default)
+- **Processing**: Application-level in Node.js event loop
+- **Features**: Full protocol support, header manipulation, WebSockets
+- **Performance**: Good for most use cases
+- **Use when**: You need application-layer features
+
+##### NFTables Engine
+- **Processing**: Kernel-level packet forwarding
+- **Features**: Basic NAT, minimal overhead
+- **Performance**: Excellent, near wire-speed
+- **Use when**: Maximum performance is critical
+- **Requirements**: Linux, root permissions, NFTables installed
+
+### Detailed Mode Explanations
+
+#### HTTP Forwarding (Port 80)
+
+Simple HTTP forwarding without encryption:
+
+```typescript
+{
+  match: { ports: 80, domains: 'example.com' },
+  action: {
+    type: 'forward',
+    target: { host: 'localhost', port: 8080 }
+  }
+}
+```
+
+**Data Flow**: Client → SmartProxy (HTTP) → Backend (HTTP)
+
+#### HTTPS with TLS Termination
+
+Decrypt HTTPS and forward as HTTP:
+
+```typescript
+{
+  match: { ports: 443, domains: 'secure.example.com' },
+  action: {
+    type: 'forward',
+    target: { host: 'localhost', port: 8080 },
+    tls: {
+      mode: 'terminate',
+      certificate: 'auto'  // Use Let's Encrypt
+    }
+  }
+}
+```
+
+**Data Flow**: Client → SmartProxy (HTTPS decrypt) → Backend (HTTP)
+
+#### HTTPS Passthrough
+
+Forward encrypted traffic without decryption:
+
+```typescript
+{
+  match: { ports: 443, domains: 'legacy.example.com' },
+  action: {
+    type: 'forward',
+    target: { host: '192.168.1.10', port: 443 },
+    tls: {
+      mode: 'passthrough'
+    }
+  }
+}
+```
+
+**Data Flow**: Client → SmartProxy (TLS forwarding) → Backend (Original TLS)
+
+#### HTTPS Gateway (Terminate and Re-encrypt)
+
+Decrypt, inspect, then re-encrypt to backend:
+
+```typescript
+{
+  match: { ports: 443, domains: 'api.example.com' },
+  action: {
+    type: 'forward',
+    target: { host: 'api-backend', port: 443 },
+    tls: {
+      mode: 'terminate-and-reencrypt',
+      certificate: 'auto'
+    },
+    advanced: {
+      headers: {
+        'X-Forwarded-Proto': 'https',
+        'X-Real-IP': '{clientIp}'
+      }
+    }
+  }
+}
+```
+
+**Data Flow**: Client → SmartProxy (HTTPS decrypt) → SmartProxy (New HTTPS) → Backend
+
+#### High-Performance NFTables Forwarding
+
+Kernel-level forwarding for maximum performance:
+
+```typescript
+{
+  match: { ports: 443, domains: 'fast.example.com' },
+  action: {
+    type: 'forward',
+    target: { host: 'backend', port: 443 },
+    tls: { mode: 'passthrough' },
+    forwardingEngine: 'nftables',
+    nftables: {
+      preserveSourceIP: true,
+      maxRate: '10gbps'
+    }
+  }
+}
+```
+
+**Data Flow**: Client → Kernel (NFTables NAT) → Backend
+
+#### Custom Socket Handler
+
+Handle custom protocols or implement specialized logic:
+
+```typescript
+{
+  match: { ports: 9000, domains: 'custom.example.com' },
+  action: {
+    type: 'socket-handler',
+    socketHandler: async (socket, context) => {
+      console.log(`Connection from ${context.clientIp}`);
+      
+      socket.write('Welcome to custom protocol server\n');
+      
+      socket.on('data', (data) => {
+        // Handle custom protocol
+        const response = processCustomProtocol(data);
+        socket.write(response);
+      });
+    }
+  }
+}
+```
+
+### Decision Guide
+
+#### Choose HTTP Forwarding When:
+- Backend only supports HTTP
+- Internal services not exposed to internet
+- Development/testing environments
+
+#### Choose HTTPS Termination When:
+- Need to inspect/modify HTTP traffic
+- Backend doesn't support HTTPS
+- Want to add security headers
+- Need to cache responses
+
+#### Choose HTTPS Passthrough When:
+- Backend manages its own certificates
+- Need true end-to-end encryption
+- Compliance requires no MITM
+- WebSocket connections to backend
+
+#### Choose HTTPS Terminate-and-Reencrypt When:
+- Need traffic inspection AND backend requires HTTPS
+- API gateway scenarios
+- Adding authentication layers
+- Different certificates for client/backend
+
+#### Choose NFTables Engine When:
+- Handling 1Gbps+ traffic
+- Thousands of concurrent connections
+- Minimal latency is critical
+- Don't need application-layer features
+
+#### Choose Socket Handler When:
+- Implementing custom protocols
+- Need fine-grained connection control
+- Building protocol adapters
+- Special authentication flows
+
+### Complete Examples
+
+#### Example 1: Complete Web Application
+
+```typescript
+const proxy = new SmartProxy({
+  routes: [
+    // HTTP to HTTPS redirect
+    {
+      match: { ports: 80, domains: ['example.com', 'www.example.com'] },
+      action: {
+        type: 'socket-handler',
+        socketHandler: SocketHandlers.httpRedirect('https://{domain}{path}')
+      }
+    },
+    
+    // Main website with TLS termination
+    {
+      match: { ports: 443, domains: ['example.com', 'www.example.com'] },
+      action: {
+        type: 'forward',
+        target: { host: 'web-backend', port: 3000 },
+        tls: {
+          mode: 'terminate',
+          certificate: 'auto'
+        },
+        websocket: { enabled: true }
+      }
+    },
+    
+    // API with re-encryption
+    {
+      match: { ports: 443, domains: 'api.example.com' },
+      action: {
+        type: 'forward',
+        target: { host: 'api-backend', port: 443 },
+        tls: {
+          mode: 'terminate-and-reencrypt',
+          certificate: 'auto'
+        }
+      },
+      security: {
+        ipAllowList: ['10.0.0.0/8'],
+        rateLimit: {
+          enabled: true,
+          maxRequests: 100,
+          window: 60
+        }
+      }
+    }
+  ]
+});
+```
+
+#### Example 2: Multi-Mode Proxy Setup
+
+```typescript
+const proxy = new SmartProxy({
+  routes: [
+    // Legacy app with passthrough
+    {
+      match: { ports: 443, domains: 'legacy.example.com' },
+      action: {
+        type: 'forward',
+        target: { host: 'legacy-server', port: 443 },
+        tls: { mode: 'passthrough' }
+      }
+    },
+    
+    // High-performance streaming with NFTables
+    {
+      match: { ports: 8080, domains: 'stream.example.com' },
+      action: {
+        type: 'forward',
+        target: { host: 'stream-backend', port: 8080 },
+        forwardingEngine: 'nftables',
+        nftables: {
+          protocol: 'tcp',
+          preserveSourceIP: true
+        }
+      }
+    },
+    
+    // Custom protocol handler
+    {
+      match: { ports: 9999 },
+      action: {
+        type: 'socket-handler',
+        socketHandler: SocketHandlers.proxy('custom-backend', 9999)
+      }
+    }
+  ]
+});
+```
+
+### Performance Considerations
+
+#### Node.js Engine Performance
+
+| Metric | Typical Performance |
+|--------|-------------------|
+| Throughput | 1-10 Gbps |
+| Connections | 10,000-50,000 concurrent |
+| Latency | 1-5ms added |
+| CPU Usage | Moderate |
+
+**Best for**: Most web applications, APIs, sites needing inspection
+
+#### NFTables Engine Performance
+
+| Metric | Typical Performance |
+|--------|-------------------|
+| Throughput | 10-100 Gbps |
+| Connections | 100,000+ concurrent |
+| Latency | <0.1ms added |
+| CPU Usage | Minimal |
+
+**Best for**: High-traffic services, streaming, gaming, TCP forwarding
+
+#### Performance Tips
+
+1. **Use passthrough mode** when you don't need inspection
+2. **Enable NFTables** for high-traffic services
+3. **Terminate TLS only when necessary** - it adds CPU overhead
+4. **Use connection pooling** for terminate-and-reencrypt mode
+5. **Enable HTTP/2** for better multiplexing
+
+### Security Implications
+
+#### TLS Termination Security
+
+**Pros:**
+- Inspect traffic for threats
+- Add security headers
+- Implement WAF rules
+- Log requests for audit
+
+**Cons:**
+- Proxy has access to decrypted data
+- Requires secure certificate storage
+- Potential compliance issues
+
+**Best Practices:**
+- Use auto-renewal with Let's Encrypt
+- Store certificates securely
+- Implement proper access controls
+- Use strong TLS configurations
+
+#### Passthrough Security
+
+**Pros:**
+- True end-to-end encryption
+- No MITM concerns
+- Backend controls security
+
+**Cons:**
+- Cannot inspect traffic
+- Cannot add security headers
+- Limited DDoS protection
+
+#### Socket Handler Security
+
+**Risks:**
+- Custom code may have vulnerabilities
+- Resource exhaustion possible
+- Authentication bypass risks
+
+**Mitigations:**
+```typescript
+{
+  action: {
+    type: 'socket-handler',
+    socketHandler: async (socket, context) => {
+      // Always validate and sanitize input
+      socket.on('data', (data) => {
+        if (data.length > MAX_SIZE) {
+          socket.destroy();
+          return;
+        }
+        // Process safely...
+      });
+      
+      // Set timeouts
+      socket.setTimeout(30000);
+      
+      // Rate limit connections
+      if (connectionsFromIP(context.clientIp) > 10) {
+        socket.destroy();
+      }
+    }
+  }
+}
+```
+
+### Migration from Legacy Types
+
+#### From `http-only`
+
+**Old:**
+```typescript
+{
+  type: 'http-only',
+  target: { host: 'localhost', port: 8080 }
+}
+```
+
+**New:**
+```typescript
+{
+  match: { ports: 80, domains: 'example.com' },
+  action: {
+    type: 'forward',
+    target: { host: 'localhost', port: 8080 }
+  }
+}
+```
+
+#### From `https-passthrough`
+
+**Old:**
+```typescript
+{
+  type: 'https-passthrough',
+  target: { host: 'backend', port: 443 }
+}
+```
+
+**New:**
+```typescript
+{
+  match: { ports: 443, domains: 'example.com' },
+  action: {
+    type: 'forward',
+    target: { host: 'backend', port: 443 },
+    tls: { mode: 'passthrough' }
+  }
+}
+```
+
+#### From `https-terminate-to-http`
+
+**Old:**
+```typescript
+{
+  type: 'https-terminate-to-http',
+  target: { host: 'localhost', port: 8080 },
+  ssl: { /* certs */ }
+}
+```
+
+**New:**
+```typescript
+{
+  match: { ports: 443, domains: 'example.com' },
+  action: {
+    type: 'forward',
+    target: { host: 'localhost', port: 8080 },
+    tls: {
+      mode: 'terminate',
+      certificate: 'auto'  // or provide cert/key
+    }
+  }
+}
+```
+
+#### From `https-terminate-to-https`
+
+**Old:**
+```typescript
+{
+  type: 'https-terminate-to-https',
+  target: { host: 'backend', port: 443 },
+  ssl: { /* certs */ }
+}
+```
+
+**New:**
+```typescript
+{
+  match: { ports: 443, domains: 'example.com' },
+  action: {
+    type: 'forward',
+    target: { host: 'backend', port: 443 },
+    tls: {
+      mode: 'terminate-and-reencrypt',
+      certificate: 'auto'
+    }
+  }
+}
+```
+
+### Helper Functions Quick Reference
+
+SmartProxy provides helper functions for common configurations:
+
+```typescript
+// HTTP forwarding
+createHttpRoute('example.com', { host: 'localhost', port: 8080 })
+
+// HTTPS with termination
+createHttpsTerminateRoute('secure.com', { host: 'localhost', port: 8080 }, {
+  certificate: 'auto'
+})
+
+// HTTPS passthrough
+createHttpsPassthroughRoute('legacy.com', { host: 'backend', port: 443 })
+
+// Complete HTTPS setup (includes HTTP redirect)
+...createCompleteHttpsServer('example.com', { host: 'localhost', port: 8080 }, {
+  certificate: 'auto'
+})
+
+// NFTables high-performance
+createNfTablesRoute('fast.com', { host: 'backend', port: 8080 }, {
+  ports: 80,
+  preserveSourceIP: true
+})
+
+// Custom socket handler
+createSocketHandlerRoute('custom.com', 9000, async (socket, context) => {
+  // Handler implementation
+})
+```
+
+### Summary
+
+SmartProxy's forwarding modes provide flexibility for any proxy scenario:
+
+- **Simple HTTP/HTTPS forwarding** for most web applications
+- **TLS passthrough** for end-to-end encryption
+- **TLS termination** for traffic inspection and modification
+- **NFTables** for extreme performance requirements
+- **Socket handlers** for custom protocols
+
+Choose based on your security requirements, performance needs, and whether you need to inspect or modify traffic. The modern route-based configuration provides a consistent interface regardless of the forwarding mode you choose.
+
 ### Route Metadata and Prioritization
 
 You can add metadata to routes to help with organization and control matching priority: