FastAPI Security Best Practices

Implement security best practices in FastAPI applications. Learn about CORS, rate limiting, input sanitization, and security headers.

📄️CORS

Understand CORS, preflight requests, and CORSMiddleware in FastAPI — including the wildcard-and-credentials trap most tutorials get wrong.

📄️HTTPS

Configure TLS termination, trusted proxy headers, and HTTPSRedirectMiddleware correctly in a production FastAPI deployment.

📄️Rate Limiting

Protect a FastAPI app from abuse with SlowAPI: per-route limits, Redis-backed scaling, accurate 429 responses, and real client IPs.

📄️Input Sanitization

How Pydantic validation actually protects a FastAPI app, why it doesn't prevent SQL injection, and where output escaping really belongs.

📄️HTTP Headers

Configure X-Content-Type-Options, CSP, HSTS, and clickjacking defenses in FastAPI, including which headers actually matter for a JSON API.

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Role-Based Access Control (RBAC)

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CORS