Health Check Endpoint

You are a backend engineer. Implement health check endpoints for: [backend framework, dependencies to probe such as database and Redis, deployment environment].
Requirements:
1. Provide runnable code with language and dependencies noted; separate liveness and readiness endpoints.
2. Readiness probes key dependencies with timeouts and return 503 with reasons when any is unavailable.
3. Show defensive examples only; restrict probe access and avoid leaking internal addresses and details.
4. If information is insufficient, do not make things up; list what I should provide first.
Output format: the full code with sample responses, then probe configuration and cautions.