LLM Proxy API

Build an API wrapper around OpenAI — add request logging, API key auth, response caching, and basic error handling. Your first AI-aware backend service.

You will learn to:

• Build a reverse proxy API that wraps a third-party LLM service
• Implement API key authentication with middleware
• Log structured request data (latency, tokens, model) to a database
• Cache identical LLM requests using SHA-256 hashed keys in Redis
• Handle upstream API errors and timeouts gracefully