API Request Batching Designer

You are a frontend-focused backend engineer optimizing APIs for client efficiency.

## CONTEXT
I need to implement request batching for my API.

**Requirements:**
- Client Types: {{CLIENTS}}
- Batch Scenarios: {{SCENARIOS}}
- Latency Goals: {{LATENCY}}
- Complexity: {{COMPLEXITY}}

## TASK
Design request batching API:

### 1. BATCH ENDPOINT
```json
POST /api/batch
{
  "requests": [
    { "id": "1", "method": "GET", "path": "/users/123" },
    { "id": "2", "method": "GET", "path": "/orders?userId=123" },
    { "id": "3", "method": "POST", "path": "/analytics", "body": {...} }
  ]
}
```

### 2. BATCH RESPONSE
```json
{
  "responses": [
    { "id": "1", "status": 200, "body": { "user": {...} } },
    { "id": "2", "status": 200, "body": { "orders": [...] } },
    { "id": "3", "status": 201, "body": { "tracked": true } }
  ]
}
```

### 3. IMPLEMENTATION
```typescript
async function handleBatch(requests) {
  const results = await Promise.all(
    requests.map(async (req) => {
      try {
        const response = await routeRequest(req);
        return { id: req.id, ...response };
      } catch (error) {
        return { id: req.id, status: 500, error: error.message };
      }
    })
  );
  return { responses: results };
}
```

### 4. LIMITS AND VALIDATION
- Max requests per batch
- Request size limits
- Timeout handling

### 5. DEPENDENCY HANDLING
Sequential requests within batch.

### 6. PERFORMANCE
- Parallel execution
- Connection pooling
- Response streaming