Design gateway architectures that handle the unique requirements of AI API traffic.
## Gateway Responsibilities
``` ┌─────────────────────────────────────────────────────────┐ │ AI API Gateway │ ├─────────────────────────────────────────────────────────┤ │ ┌─────────┐ ┌─────────┐ ┌─────────┐ ┌─────────┐ │ │ │ Auth │ │ Rate │ │ Routing │ │ Caching │ │ │ │ │ │ Limiting│ │ │ │ │ │ │ └─────────┘ └─────────┘ └─────────┘ └─────────┘ │ │ ┌─────────┐ ┌─────────┐ ┌─────────┐ ┌─────────┐ │ │ │Fallback │ │ Logging │ │ Metrics │ │ Cost │ │ │ │ │ │ │ │ │ │ Control │ │ │ └─────────┘ └─────────┘ └─────────┘ └─────────┘ │ └─────────────────────────────────────────────────────────┘ │ ┌───────────────┼───────────────┐ ▼ ▼ ▼ ┌─────────┐ ┌─────────┐ ┌─────────┐ │ OpenAI │ │ Anthropic│ │ Google │ └─────────┘ └─────────┘ └─────────┘ ```
## Core Gateway Implementation
```typescript interface AIGatewayConfig { providers: ProviderConfig[]; rateLimits: RateLimitConfig; fallbackStrategy: 'failover' | 'load-balance' | 'cost-optimize'; caching: CacheConfig; }
class AIGateway { async route(request: AIRequest): Promise<AIResponse> { // 1. Authentication await this.authenticate(request); // 2. Rate limiting await this.checkRateLimit(request.userId); // 3. Check cache const cached = await this.cache.get(request); if (cached) return cached; // 4. Route to provider const provider = this.selectProvider(request); // 5. Execute with fallback const response = await this.executeWithFallback(provider, request); // 6. Cache response await this.cache.set(request, response); // 7. Log and emit metrics this.logRequest(request, response); return response; } } ```