A reverse proxy is a server that stands in front of your application servers and handles incoming traffic on their behalf. A visitor’s browser connects to the reverse proxy, and the proxy decides which backend server should answer, then passes the response back. The backend stays hidden from the outside world.
Think of a receptionist at a large office. Guests do not wander the hallways looking for the right person. They check in at the front desk, and the receptionist directs them to the correct room, screens out anyone who should not be there, and keeps the building secure. A reverse proxy plays that receptionist role for web traffic, and it is often built with Nginx or runs through a service like Cloudflare.
Besides routing, a reverse proxy can terminate HTTPS, cache common responses to take pressure off the backend, and act as a load balancer across several machines. That makes it a useful single place to enforce rules. Need to add rate limiting so one client cannot flood you with requests? You set it once at the proxy. Want to block traffic from a region, or swap the backend without changing the public address? Same place. This is also where it differs from a forward proxy, which people often confuse it with. A forward proxy sits in front of users and hides them from the wider internet, the way a company network might route all staff through one gateway. A reverse proxy sits in front of servers and hides them from users. So the two face opposite directions, even though both pass traffic along on someone’s behalf.
At TopDevs we put a reverse proxy in front of the apps we host, so we can add security, caching and routing without changing a line of the application code.
