Reverse vs Forward Proxy
Which Side Each Proxy Represents
Reverse proxy vs forward proxy comes down to one question: which side of the connection does the proxy represent? A forward proxy acts on behalf of clients, the devices that send requests. A reverse proxy acts on behalf of servers, the machines that receive them. Both sit between two parties and forward traffic, but they protect and serve different sides.
In a forward proxy setup, the client is configured to send its requests through the proxy, and the destination server sees the proxy's address rather than the client's. In a reverse proxy setup, the visitor usually does not know a proxy exists. The visitor sends requests to a public address, and the reverse proxy decides which server handles them.
Forward Proxies: Acting for Clients
A forward proxy is common in offices, schools and other networks that want to control or record outbound web traffic. Employee browsers send requests to the proxy, which can block certain sites, scan downloads or keep logs. Because the proxy sits between the network and the internet, it can also hide the internal addresses of client devices from outside servers.
Forward proxies also appear in privacy services, where user traffic passes through an intermediate server so that the destination sees a different address. The common idea is that the client side sets up and benefits from the proxy.
Reverse Proxies: Acting for Servers
A reverse proxy is used by website owners and service operators. It sits in front of one or more application servers, receives incoming requests and decides how to handle them. It can serve cached responses, balance load, terminate HTTPS and hide the addresses of the servers behind it. Visitors do not configure anything. They use the public domain name.
Content delivery networks use the same principle. Their edge servers act as reverse proxies in front of the website's origin, which is why a content delivery network and a reverse proxy share so much behavior.
Example: The Same Software in Two Roles
Software such as NGINX or Squid can run in either role. Consider a company. Its office proxy, set in employee browsers, controls which sites staff can reach. That is a forward proxy. The same company's public website, served by Varnish in front of its application, is a reverse proxy. The software can be the same, but the direction of trust and the people it protects are different.
Frequently asked questions
Can One Proxy Be Both Forward and Reverse?
Technically, yes. Some proxy software can run both roles on different ports or addresses. However, a single deployment usually has one clear purpose. Mixing roles can blur who is responsible for logging, access control and security. Most teams keep forward and reverse proxies separate and document what each one does.
Which Proxy Type Do Website Owners Usually Need?
Most website owners encounter reverse proxies, either as software on their own server or as a service from a CDN or hosting platform. Forward proxies matter mostly to organizations that manage client networks. A small site owner rarely runs a forward proxy but may already use a reverse proxy without knowing it.