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A reverse proxy sits between clients and one or more servers: it receives requests, forwards them upstream, and returns the responses. That position lets it handle several shared traffic responsibilities—not just load balancing—including routing, TLS connections, response delivery, and operational controls. The five concerns below are a useful way to understand the role, not a formal standard or a feature set every proxy must provide.
What does a reverse proxy do?
A reverse proxy is defined by where it sits in the request path. Clients connect to the proxy rather than directly to the application servers behind it; the proxy selects an upstream, forwards the request, receives the response, and sends it back to the client. It can front one upstream or many. Load balancing is a common use, but it is not the definition of a reverse proxy.
Because the proxy handles traffic on its way into and out of applications, it can provide a shared place for rules that would otherwise be configured separately at each application or server. Which capabilities are available depends on the implementation and its configuration.
The five concerns a reverse proxy can bring together
1. Routing requests to upstreams
The proxy can choose which upstream service receives a request, based on its configuration and, for HTTP-aware routing, details in the request. It can also adjust headers sent upstream. For example, NGINX documents directives for setting headers such as Host and X-Real-IP, and notes that proxied requests have default handling for Host and Connection. The right configuration depends on what the application needs to know about the requested host and the original client.
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Preserving or deliberately setting this information matters: an application may use the host to select a site or generate links, and may rely on forwarded client details for logging or policy. Do not assume a proxy passes every client header through unchanged.
2. Managing two separate TLS connections
A reverse proxy can terminate TLS from the client, then make a separately configured connection to the upstream. These are two distinct legs: client-to-proxy and proxy-to-origin. Encrypting the first does not establish that the second is encrypted, nor that the origin’s certificate is verified. Envoy’s TLS architecture documents both listener-side TLS termination and upstream TLS origination.
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When evaluating a design, establish where client TLS ends, whether upstream traffic uses TLS, how the upstream certificate is validated, and whether the application’s protocol requirements are met.
3. Distributing traffic and responding to unhealthy servers
When several upstream servers are available, a proxy can distribute requests among them. Health monitoring can affect whether an endpoint receives traffic, but implementations differ. For example, Cloudflare’s load-balancing documentation describes periodic monitor requests and removal of unhealthy pools from rotation; its quickstart also requires multiple endpoints for that setup.
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Failover depends on the traffic layer. Layer 7 routing can make decisions using HTTP request information. Layer 4 routing works at the transport level, while DNS-only configurations return DNS answers rather than proxying the HTTP request itself. DNS-based failover therefore follows DNS behavior and is not interchangeable with request-by-request proxy routing. Cloudflare’s documentation distinguishes these modes and was last updated April 16, 2026.
4. Controlling response delivery and caching
Two often-confused controls are caching and buffering. A cache can serve an eligible response without fetching it again from the origin. Buffering lets the proxy read an upstream response while a slower client downloads it. Buffering alone does not make an application faster, and caching is not safe for every response.
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Cache policy can affect correctness and privacy. NGINX documents how response headers—including Cache-Control, Expires, Set-Cookie, and Vary—affect cache handling, along with controls for stale responses. Before enabling caching, decide which responses are eligible, how representations vary, and how content is invalidated. Treat cookie-bearing or user-specific responses with particular care.
5. Operating and observing shared traffic rules
Proxy configuration becomes operational configuration for every application that depends on it. Routing, TLS, cache, and availability rules need clear ownership, controlled rollout and rollback, and monitoring that can help operators diagnose failures. NGINX documentation and the NGINX Cookbook, 3rd Edition cover implementation topics such as configuration, monitoring, and debugging; neither establishes a universal observability feature set or a guaranteed operational gain.
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Is a reverse proxy the same as a load balancer?
No. A load balancer distributes traffic among available servers; a reverse proxy is an intermediary in front of upstream servers. A reverse proxy may perform load balancing, but it can also route traffic to a single upstream or handle other request and response functions. The NGINX guide describes load balancing as a common use of a reverse proxy, not as a synonym for the whole role.
How to compare reverse-proxy options
Compare the architecture and operating model, not just whether a product advertises “proxy” or “load balancing.” A self-managed proxy such as NGINX or Envoy leaves configuration and infrastructure operation with your team. A managed edge service can shift some infrastructure work to its provider, while adding provider-specific configuration and dependency considerations.
| Decision | What to establish |
|---|---|
| Traffic layer | Whether routing is layer 4, layer 7, or DNS-only. Layer 7 can use HTTP request details; DNS-only does not proxy the HTTP request. |
| Upstream behavior | How requests are distributed, how health is determined, what triggers failover, and whether required application protocols are supported. Health-check mechanisms are product-specific. |
| TLS design | Where client TLS terminates, whether proxy-to-origin traffic is encrypted, whether certificates are verified, and whether protocol requirements are met. |
| Response handling | Which responses can be cached, how invalidation works, how cookies and Vary are treated, whether stale responses are allowed, and how buffering behaves. |
| Operational fit | Who owns configuration, how changes are rolled out and rolled back, what visibility operators need, what support is available, and what happens if the shared proxy layer is unavailable. |
Cloudflare’s official documentation illustrates why the traffic-layer distinction matters: its load-balancing setup covers pools and health monitors, while its proxy-mode guidance distinguishes proxied traffic from DNS-only behavior. Those details describe Cloudflare’s options, not a universal health-check or failover standard.
What the shared layer changes architecturally
Centralizing traffic rules can make them consistent across applications, but it also creates coupling. A change to routing, TLS, caching, or availability may affect more than one upstream. The impact depends on the topology, redundancy, rollout process, and whether the proxy itself is a single point of failure. A proxy is therefore not automatically a reliability improvement; its value depends on how it is operated and designed.
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NGINX Cookbook, 3rd Edition is implementation-focused further reading. O’Reilly describes practical recipes for application delivery, including load balancing, security, and monitoring, covering NGINX and NGINX Plus. It is not a comprehensive survey of reverse-proxy architectures.
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