The term “reverse proxy” sounds technical, but the concept is straightforward once you understand what problem it solves. If you run any web-based services (internally or externally) a reverse proxy is a tool worth understanding.
What a Reverse Proxy Does
A reverse proxy is a server that sits in front of one or more backend services and handles requests on their behalf. When a client (a browser, an app, a user) makes a request, it hits the reverse proxy first. The proxy forwards the request to the appropriate backend service, receives the response, and passes it back to the client.
From the client’s perspective, it’s communicating directly with the service. The backend server’s details are hidden.
This indirection enables several useful things.
Common Use Cases
SSL/TLS Termination
Encrypting web traffic with HTTPS requires an SSL/TLS certificate. Managing certificates on every individual service is cumbersome. A reverse proxy can handle SSL termination centrally; accepting encrypted HTTPS connections from clients, then forwarding traffic to backend services over an internal connection (which may or may not need its own encryption, depending on your architecture).
Tools like Caddy handle certificate management automatically via Let’s Encrypt, removing the overhead of manual certificate renewal entirely.
Single Entry Point for Multiple Services
If you run multiple internal web applications (a project management tool, a file manager, a monitoring dashboard) a reverse proxy lets you expose them all through a single IP address and port, routing requests to the correct backend based on the domain name or URL path.
For example: projects.yourdomain.com routes to one service, files.yourdomain.com to another, all through the same external IP, with the reverse proxy handling the routing.
Remote Access to Internal Web Applications
Rather than exposing a service directly on a public port, a reverse proxy can sit in the DMZ or be secured with authentication, providing a controlled entry point. Combined with your firewall rules, this reduces the attack surface compared to exposing backend services directly.
Load Balancing
For businesses running multiple instances of an application (less common at SME scale, but relevant for hosted services), a reverse proxy can distribute incoming requests across them, improving availability and performance.
Web Application Firewall (WAF)
Some reverse proxies include WAF capabilities, inspecting incoming requests for common attack patterns (SQL injection, cross-site scripting) and blocking them before they reach the application.
Popular Tools
NGINX
The most widely deployed reverse proxy and web server. Highly capable, well-documented, and used everywhere from small self-hosted setups to large-scale infrastructure. Configuration is file-based, which gives you precise control but requires some familiarity to set up correctly.
Caddy
A modern reverse proxy focused on simplicity and automatic HTTPS. Caddy automatically obtains and renews SSL certificates via Let’s Encrypt with no manual configuration. Its configuration syntax is cleaner than NGINX, making it a good choice for SMEs and self-hosted environments.
Traefik
Designed for containerised environments (Docker, Kubernetes). Traefik automatically discovers services and configures routing dynamically. If you’re running Docker-based services on a server or NAS, Traefik integrates well and reduces manual configuration.
HAProxy
Focused on load balancing and high availability. Excellent performance and flexibility, but primarily relevant for environments where distributing load across multiple backend servers is a requirement.
Do You Actually Need One?
For most small businesses, a reverse proxy is relevant if you:
- Self-host any web-based applications internally or externally
- Want to expose multiple services through a single domain with HTTPS
- Need to provide remote access to internal tools without a full VPN
- Are running a NAS (Synology, QNAP, TrueNAS) with services you want to access remotely
If your business uses entirely cloud-hosted SaaS applications and doesn’t self-host anything, a reverse proxy probably isn’t on your immediate agenda.