API Proxy vs Reverse Proxy vs API Gateway

Yilia Lin

Yilia Lin

June 10, 2026

Technology

Key Takeaways

  • A reverse proxy sits in front of servers and forwards client requests to backend systems, often adding load balancing, TLS termination, caching, and basic traffic control.
  • An API proxy focuses on forwarding API requests while abstracting backend URLs, credentials, or protocol details from API consumers.
  • An API Gateway is a broader control plane for APIs, adding authentication, authorization, rate limits, transformations, observability, lifecycle governance, and developer-facing API management.
  • The three patterns overlap, but they are not interchangeable. The difference is mainly scope, policy depth, and API-specific governance.
  • Apache APISIX can act as a reverse proxy, API proxy, and full API Gateway depending on how routes, upstreams, and plugins are configured.
  • Teams should choose based on the problem: server traffic routing, API abstraction, or organization-wide API governance.

The terms API proxy, reverse proxy, and API Gateway are often used interchangeably. That is understandable because all three sit between clients and backend services. All three can forward requests. All three can hide backend details. In some products, the same software can implement all three patterns.

But the differences matter. If your team only needs to route traffic to a web server, a reverse proxy may be enough. If you need to hide a backend API URL and normalize request paths, an API proxy may be enough. If you need authentication, rate limiting, versioning, analytics, developer onboarding, and policy governance across many APIs, you need an API Gateway.

Misunderstanding the difference leads to architectural drift. Teams may build API security into application code because the reverse proxy does not provide it. They may use a simple proxy for public partner APIs and later discover they lack quotas, audit logs, or lifecycle controls. Or they may deploy a heavy API management platform for a use case that only needs basic load balancing.

This article explains the differences clearly and shows where Apache APISIX fits.

What Is a Reverse Proxy?

A reverse proxy is a server-side proxy that receives requests from clients and forwards them to one or more backend servers. From the client's perspective, the reverse proxy is the server. The client does not need to know which upstream instance handles the request.

NGINX's reverse proxy documentation describes a common pattern: proxying requests to backend servers and using directives such as proxy_pass to forward traffic. In practice, reverse proxies are widely used for TLS termination, load balancing, compression, caching, static asset delivery, routing by hostname or path, and shielding backend servers from direct exposure.

flowchart LR
    Client[Client browser or app]
    Proxy[Reverse proxy]
    Web1[Web server 1]
    Web2[Web server 2]
    App[Application server]

    Client --> Proxy
    Proxy --> Web1
    Proxy --> Web2
    Proxy --> App

A reverse proxy is infrastructure-oriented. It answers questions like:

  • Which backend server should receive this request?
  • Should TLS terminate here?
  • Should static content be cached?
  • Should traffic be load balanced across instances?
  • Should a request path be routed to a different service?

This is valuable, but it is not the full API governance problem. A reverse proxy may not understand API products, consumers, scopes, developer portals, quotas, schema validation, or version lifecycle. Some reverse proxies can be extended with modules or scripts, but the core pattern is server traffic mediation.

Use a reverse proxy when you need efficient request forwarding, TLS termination, load balancing, or web traffic routing. It is a strong fit for many web applications and internal services. It becomes insufficient when APIs require consumer-aware policy and lifecycle management. For a deeper comparison, see API7's guide to API gateway vs reverse proxy.

What Is an API Proxy?

An API proxy is a proxy specifically designed around API traffic. It forwards requests from API consumers to backend APIs while abstracting backend details. The consumer calls the proxy endpoint, and the proxy handles the upstream URL, path rewriting, headers, credentials, or protocol-specific details.

API proxies are common when teams want a stable public API while backend services change. For example, a company may expose /v1/orders to partners while routing the request to an internal order service with a different path. The API proxy can rewrite paths, add headers, strip internal details, or aggregate simple routing rules.

sequenceDiagram
    participant Client as API Consumer
    participant Proxy as API Proxy
    participant Backend as Backend API

    Client->>Proxy: GET /v1/orders/123
    Proxy->>Proxy: Rewrite path and attach upstream headers
    Proxy->>Backend: GET /internal/order-service/orders/123
    Backend-->>Proxy: Return order response
    Proxy-->>Client: Return normalized API response

An API proxy answers questions like:

  • How do we expose a stable API URL while backend services move?
  • How do we hide internal hostnames and service paths?
  • How do we add or remove headers before forwarding?
  • How do we route API versions to different upstreams?
  • How do we adapt a simple external API contract to internal service structure?

Here is a basic APISIX route that works as an API proxy. It exposes /api/v1/orders/*, forwards to an internal upstream, and rewrites the path before proxying.

curl -i "http://127.0.0.1:9180/apisix/admin/routes/orders-api-proxy" \
  -H "X-API-KEY: ${APISIX_ADMIN_KEY}" \
  -X PUT -d '
{
  "name": "orders-api-proxy",
  "uri": "/api/v1/orders/*",
  "upstream": {
    "type": "roundrobin",
    "nodes": {
      "orders-service.internal:8080": 1
    }
  },
  "plugins": {
    "proxy-rewrite": {
      "regex_uri": ["^/api/v1/orders/(.*)", "/internal/orders/$1"],
      "headers": {
        "X-API-Version": "v1"
      }
    }
  }
}'

This is useful API abstraction. However, a simple API proxy may still be missing deeper controls: authentication, authorization, rate limits, quotas, developer onboarding, analytics, schema validation, monetization, or policy governance. Once those become requirements, the architecture moves toward an API Gateway.

What Is an API Gateway?

An API Gateway is a policy enforcement and management layer for APIs. It still proxies requests, but its purpose is broader than forwarding. It controls how APIs are exposed, secured, observed, governed, and operated.

API Gateways commonly provide:

  • Authentication and authorization.
  • Rate limiting, quotas, and traffic shaping.
  • Request and response transformation.
  • API version routing and canary releases.
  • Load balancing and upstream health checks.
  • Request validation and protocol mediation.
  • Logs, metrics, tracing, and analytics.
  • Consumer management and API key lifecycle.
  • Developer portal and documentation integration.
  • Governance policies across teams and environments.
flowchart TD
    Client[API consumers]
    Gateway[API Gateway]
    Auth[Auth and consumer identity]
    Traffic[Rate limits and quotas]
    Transform[Rewrite and transformation]
    Observe[Logs, metrics, traces]
    ServiceA[Orders API]
    ServiceB[Payments API]
    ServiceC[Inventory API]

    Client --> Gateway
    Gateway --> Auth
    Gateway --> Traffic
    Gateway --> Transform
    Gateway --> Observe
    Gateway --> ServiceA
    Gateway --> ServiceB
    Gateway --> ServiceC

The gateway is API-aware. It knows routes, consumers, plugins, upstreams, and policies. It can apply different controls to different APIs and consumers. A public partner API may require OAuth, quota enforcement, and detailed audit logs. An internal API may require mTLS, service identity, and lower latency. A migration route may need traffic splitting between old and new upstreams.

Apache APISIX is an API Gateway built around high-performance routing and a plugin architecture. It can behave like a reverse proxy, but its strength is API-specific policy. With APISIX, teams can configure routes, upstreams, authentication, rate limits, request validation, observability, and transformations through declarative API gateway configuration.

Here is an APISIX route that acts as a gateway rather than only a proxy:

curl -i "http://127.0.0.1:9180/apisix/admin/routes/orders-gateway" \
  -H "X-API-KEY: ${APISIX_ADMIN_KEY}" \
  -X PUT -d '
{
  "name": "orders-gateway",
  "uri": "/api/v1/orders/*",
  "upstream": {
    "type": "roundrobin",
    "nodes": {
      "orders-service.internal:8080": 1
    },
    "timeout": {
      "connect": 3,
      "send": 10,
      "read": 10
    }
  },
  "plugins": {
    "key-auth": {},
    "limit-count": {
      "count": 500,
      "time_window": 60,
      "rejected_code": 429,
      "key_type": "var",
      "key": "consumer_name"
    },
    "proxy-rewrite": {
      "regex_uri": ["^/api/v1/orders/(.*)", "/internal/orders/$1"]
    }
  }
}'

Compared with the API proxy example, this route adds authentication and rate limiting. In production, teams may add OpenID Connect, mTLS, request validation, logging, tracing, or traffic-split plugins depending on the API's risk and business requirements.

API Proxy vs Reverse Proxy vs API Gateway: The Key Differences

The easiest way to compare these patterns is by scope.

A reverse proxy focuses on server-side traffic routing. It is excellent for load balancing, TLS termination, caching, and forwarding web requests to backend servers. It may not know much about API consumers or API lifecycle.

An API proxy focuses on API abstraction. It hides backend structure, exposes stable API URLs, rewrites paths, and forwards requests to backend APIs. It is more API-specific than a general reverse proxy, but it may still be limited to forwarding and transformation.

An API Gateway focuses on API governance. It proxies traffic, but also enforces security, traffic, observability, and lifecycle policies across API products and consumers.

comparison:
  reverse_proxy:
    main_goal: "Server-side request forwarding and load balancing"
    common_features:
      - TLS termination
      - load balancing
      - caching
      - path or host routing
    best_for: "Web traffic and backend server protection"
  api_proxy:
    main_goal: "API abstraction and request forwarding"
    common_features:
      - stable API endpoint
      - path rewriting
      - header manipulation
      - backend URL hiding
    best_for: "Simple API facade and backend decoupling"
  api_gateway:
    main_goal: "API security, traffic control, and governance"
    common_features:
      - authentication
      - authorization
      - rate limiting
      - observability
      - request validation
      - version and consumer management
    best_for: "Production API programs across teams and environments"

The distinction is not always about products. It is about the job you need the component to perform. The same platform, such as APISIX, can implement all three patterns. A minimal APISIX route can be a reverse proxy. A route with path rewriting can be an API proxy. A route with authentication, quotas, observability, and governance becomes part of an API Gateway architecture.

When Should You Use Each Pattern?

Use a reverse proxy when the main requirement is web or service traffic routing. Examples include routing example.com to a web application, balancing traffic across backend instances, terminating TLS, or caching static content. This pattern is simple and effective.

Use an API proxy when the main requirement is API abstraction. Examples include hiding internal service paths, exposing a stable API contract while backend services change, routing /v1 and /v2 to different upstreams, or translating headers for a backend API.

Use an API Gateway when the API has consumers, risk, scale, or lifecycle requirements. Public APIs, partner APIs, internal platform APIs, AI tool APIs, payment APIs, and multi-team microservice APIs usually need gateway-level controls. If you need to answer "who called what, how often, under which policy, and with what result," you are in API Gateway territory.

One practical rule: if failure affects only routing, a proxy may be enough. If failure affects security, compliance, developer experience, or business operations, use an API Gateway. API7's overview of API gateway policies explains how those controls usually map to real production requirements.

How APISIX Bridges the Three Patterns

Apache APISIX is often described as an API Gateway, but it can also serve as a reverse proxy and API proxy because those capabilities are part of gateway behavior. Routes define how requests match. Upstreams define where requests go. Plugins define what policies apply.

For a reverse proxy use case, APISIX can route traffic to upstream nodes and balance requests.

For an API proxy use case, APISIX can rewrite paths, manipulate headers, and hide backend structure.

For an API Gateway use case, APISIX can add authentication, rate limiting, request validation, traffic splitting, observability, and service governance. API7 Enterprise builds on APISIX for enterprise API management, multi-environment governance, and operational workflows.

This flexibility matters because architecture evolves. A team may start with simple proxying, then add authentication, then quotas, then analytics, then partner onboarding. Choosing a gateway-capable platform early can prevent painful migrations later.

Conclusion

API proxy, reverse proxy, and API Gateway are related, but they solve different layers of the traffic and governance problem. A reverse proxy forwards and protects server traffic. An API proxy abstracts backend APIs. An API Gateway governs APIs as products and operational assets.

For small routing needs, a reverse proxy can be the right tool. For simple API abstraction, an API proxy may be enough. For production APIs that need security, traffic management, observability, and lifecycle control, an API Gateway is the better architectural foundation.

Apache APISIX gives teams a flexible path across all three patterns. You can start with routing, add API proxy behavior with rewriting, and grow into full API Gateway governance with plugins and API7 management capabilities. The important part is to choose the pattern that matches the risk and maturity of the API you are exposing.

Tags:
API Gateway
API Proxy
API Architecture