Understanding Reverse Proxy: Why I Put Nginx in Front of Next.js

In Phase 3 of my Nginx Routing Lab, I learned one of the most important patterns used in real-world web deployments — the Reverse Proxy.

Instead of letting my Next.js application listen directly on port 443 (which would be insecure and complicated), I made Nginx the public face of my server. Nginx handles all incoming HTTPS traffic, SSL certificates, security headers, and then quietly forwards the request to my Next.js app running on localhost:3000.

How the Traffic Flows

Browser → Nginx (port 443) → PM2 → Next.js (port 3000) → Response back the same way.

My Next.js app has no idea it’s behind a proxy. It just thinks it’s receiving normal HTTP requests on port 3000. This separation of concerns makes everything much cleaner and more secure.

Why This Architecture is Better

• Nginx handles SSL termination (Let’s Encrypt certificates)
• I can easily add more applications later on the same server
• Security headers and rate limiting are managed in one place
• PM2 only needs to keep the app alive on an internal port