What Is a Reverse Proxy? A Beginner’s Guide to How It Works
A reverse proxy is a server placed in front of backend servers. It receives client requests, forwards them to the right server, and returns the response. To the user, the proxy looks like the entire website, while the origin servers remain hidden.
Think of it as a receptionist: every visitor goes through a single point of contact instead of walking straight to an employee. The receptionist routes requests, filters unwanted traffic, and keeps the office secure.
Why Use a Reverse Proxy?
- Load balancing: distribute traffic across servers to avoid overload.
- Security: hide backend servers from direct exposure.
- Caching: store static content to reduce latency.
- SSL termination: handle HTTPS encryption at one point.
How It Works
When a request hits the proxy, rules determine which backend server should handle it. The proxy sends the request, waits for the response, and relays it to the client. Because this happens in milliseconds, it is invisible to the user.
Common Use Cases
- Microservices: route API calls to different services.
- Scaling: add more servers behind one public address.
- Security: filter traffic and block DDoS attacks.
In short, a reverse proxy makes infrastructure more secure, reliable, and efficient. Whether you run a small API or a large platform, it is a critical piece of modern web architecture.
