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Reverse ProxyvsLoad Balancer
What is the difference between a reverse proxy and a load balancer?
Updated 2 min read6 differences
In short
A reverse proxy forwards requests to the servers behind it and adds TLS, caching and security, while a load balancer spreads load so no server is overloaded.
Reverse Proxy
A reverse proxy is a server that sits in front of web servers, accepts client requests on their behalf, and forwards each request to the right backend server.
Read the page on Reverse ProxyLoad Balancer
A load balancer is a server or service that spreads incoming traffic across several backend servers so no single one is overloaded and the app stays available.
Read the page on Load BalancerReverse Proxy and Load Balancer compared
| Aspect | Reverse Proxy | Load Balancer |
|---|---|---|
| Main job | Act as the single front door for backend servers | Spread traffic across multiple servers |
| Number of backends | Useful even with just one | Needs a pool of two or more |
| Network layer | Layer 7: understands HTTP | Layer 4 (TCP/UDP) or layer 7 (HTTP) |
| Typical features | TLS termination, caching, compression, URL routing | Health checks, balancing algorithms, sticky sessions, failover |
| Security role | Hides backends, filters requests, enforces rate limits | Removes failed servers and hides backend addresses |
| Scope | Usually one site or a group of services | Can span servers, availability zones or regions |
The difference, explained
A reverse proxy is a server that accepts requests from clients on behalf of one or more backend servers, forwards them and returns the responses, so clients never talk to the backends directly. A load balancer distributes incoming traffic across a pool of servers using an algorithm such as round robin or least connections, and removes unhealthy servers from the pool.
The difference is their main purpose. A reverse proxy is the front door: it terminates TLS, caches and compresses responses, rewrites URLs, routes paths like /api and /app to different services, and hides the internal network. A load balancer is about distribution and availability: it only makes sense when there are several servers to share the work, and it can operate at layer 4 (TCP and UDP) or layer 7 (HTTP).
In practice the roles overlap heavily. Most reverse proxy servers can also load balance, and every layer-7 load balancer is a kind of reverse proxy, so one component often does both jobs. A common setup puts a layer-4 load balancer at the edge, spreading traffic across several reverse proxies that then route requests to application servers.
A common misconception is that a reverse proxy is only useful with many servers. Even with a single backend, it adds TLS, caching, rate limiting and protection. In the other direction, a layer-4 load balancer does not read HTTP at all, so it cannot route by URL or cache responses.
Which one should you use?
Choose Reverse Proxy when…
- You need TLS, caching or compression in front of an app.
- You want to route different URL paths to different services.
- You have a single backend but want to hide and protect it.
Choose Load Balancer when…
- Traffic is more than one server can handle.
- The service must stay up when individual servers fail.
- You are balancing non-HTTP traffic, such as database or game connections.
Readers ask
Is a load balancer a reverse proxy?
A layer-7 load balancer is a kind of reverse proxy, because it receives client requests and forwards them to backends. A layer-4 load balancer only forwards network connections and doesn't inspect HTTP.
Can one server be both a reverse proxy and a load balancer?
Yes. Most modern reverse proxy servers can spread traffic across several backends, so small and medium systems often use one component for both roles.
What is the difference between a reverse proxy and a forward proxy?
A forward proxy acts for clients that reach out to the internet, while a reverse proxy acts for servers that receive traffic from the internet.