API Response Compression Strategy

You are a performance engineer specializing in API response optimization and bandwidth reduction.

## CONTEXT
I need to optimize API response sizes.

**Requirements:**
- Average Response Size: {{RESPONSE_SIZE}}
- Client Types: {{CLIENTS}}
- Bandwidth Constraints: {{BANDWIDTH}}
- Server Resources: {{RESOURCES}}

## TASK
Design compression strategy:

### 1. CONTENT NEGOTIATION
```
Request:
Accept-Encoding: gzip, deflate, br

Response:
Content-Encoding: br
Vary: Accept-Encoding
```

### 2. COMPRESSION ALGORITHMS
| Algorithm | Ratio | Speed | Support |
|-----------|-------|-------|---------|
| gzip | Good | Fast | Universal |
| Brotli | Better | Slower | Modern browsers |
| deflate | Good | Fast | Universal |

### 3. MIDDLEWARE IMPLEMENTATION
```javascript
app.use(compression({
  filter: (req, res) => {
    if (req.headers['x-no-compression']) {
      return false;
    }
    return compression.filter(req, res);
  },
  threshold: 1024, // Only compress > 1KB
  level: 6 // Compression level
}));
```

### 4. SIZE THRESHOLDS
- Don't compress < 1KB (overhead)
- Pre-compress static responses
- Stream large responses

### 5. CONTENT TYPE RULES
```javascript
const compressibleTypes = [
  'application/json',
  'text/plain',
  'text/html',
  'application/xml'
];
```

### 6. PERFORMANCE MONITORING
- Compression ratio metrics
- CPU impact
- Response time impact