Reverse Proxy Comparison: NGINX vs Caddy vs Traefik vs HAProxy

What Is a Reverse Proxy?

A reverse proxy sits in front of backend services and forwards client requests to them. It represents servers and is a core component of modern web infrastructure.

Common responsibilities include:

• Request routing
• TLS termination (HTTPS)
• Load balancing and failover
• Rate limiting and access control
• Hiding internal services

Reverse proxies are widely used for APIs, microservices, and production web applications.

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When Do You Need One?

You should use a reverse proxy if:

• You serve multiple services or domains from one IP
• You need HTTPS and certificate management
• Your backend services should not be publicly exposed
• You want scalability or redundancy
• You run Docker or Kubernetes

Even single-service deployments benefit from better security and flexibility.

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High-Level Comparison

• Caddy: simplicity and automatic HTTPS
• NGINX: flexibility and ecosystem maturity
• Traefik: dynamic routing for containers
• HAProxy: performance and precise traffic control

Each tool targets a different operational need.

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Caddy

Caddy is a modern reverse proxy with secure defaults and zero-configuration HTTPS.

Best for:

• Small to medium projects
• Simple VPS deployments
• Developers who want minimal setup

Pros:

• Automatic TLS
• Clean configuration
• Modern protocol support

Cons:

• Smaller ecosystem
• Less low-level tuning

Choose Caddy when speed and simplicity matter most.

Minimal production-ready reverse proxy

1example.com {
2    reverse_proxy app:3000
3
4    # Basic security headers
5    header {
6        X-Content-Type-Options "nosniff"
7        X-Frame-Options "DENY"
8        Referrer-Policy "strict-origin-when-cross-origin"
9    }
10}

This example shows a single, production-ready Caddy configuration that balances simplicity with essential security. HTTPS, modern TLS, and correct proxy headers are handled automatically by Caddy.

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NGINX

NGINX is the most widely used reverse proxy and web server in production.

Best for:

• High-traffic websites
• APIs with complex routing
• Traditional production setups

Pros:

• Extremely flexible
• Massive ecosystem
• Proven at scale

Cons:

• Manual TLS setup by default
• Configurations can become complex

Choose NGINX when you need control and long-term reliability.

Minimal production-ready reverse proxy

1# Redirect HTTP to HTTPS
2server {
3    listen 80;
4    server_name example.com www.example.com;
5
6

This configuration provides TLS termination, reverse proxying to an upstream application, WebSocket support, timeouts, and essential security headers — all in a compact, production-ready form.

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Traefik

Traefik is designed for dynamic infrastructure and containerized environments.

Best for:

• Docker and Docker Compose
• Kubernetes clusters
• Microservices

Pros:

• Automatic service discovery
• Dynamic config without reloads
• Built-in dashboard

Cons:

• Less suited for static setups
• Provider-centric configuration

Choose Traefik when services change frequently.

Minimal production-ready reverse proxy (Traefik + Docker)

1# docker-compose.yaml
2
3services:
4  traefik:
5    image: "traefik:v3.4"
6    

This example uses Let’s Encrypt for automatic HTTPS, applies essential security headers and an optional IP allowlist, and reverse proxies multiple containers including a dashboard and two services.

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HAProxy

HAProxy is a high-performance TCP/HTTP load balancer focused on precision and speed.

Best for:

• High-volume or low-latency systems
• Infrastructure-heavy organizations
• Dedicated traffic layers

Pros:

• Excellent performance
• Advanced load balancing
• Strong observability

Cons:

• Steeper learning curve
• Not beginner-friendly

Choose HAProxy when performance and control are critical.

Minimal production-ready reverse proxy

1global
2    log stdout format raw local0
3    maxconn 2000
4    tune.ssl.default-dh-param 2048
5
6defaults
7    log     global
8    mode    http
9    option  httplog
10    option  dontlognull
11    timeout connect 10s
    timeout client  30s
    timeout server  30s
    option  forwardfor

frontend http
    bind *:80
    # Redirect all HTTP to HTTPS
    redirect scheme https code 301 if !{ ssl_fc }

frontend https
    bind *:443 ssl crt /etc/haproxy/certs/example.com.pem
    default_backend app

    # Basic security headers
    http-response set-header X-Content-Type-Options "nosniff"
    http-response set-header X-Frame-Options "DENY"
    http-response set-header Referrer-Policy "strict-origin-when-cross-origin"

backend app
    server app1 127.0.0.1:3000 check

This configuration provides HTTPS termination, reverse proxying to a backend application, basic security headers, and timeouts, while keeping the configuration minimal for a production environment.

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Which One Should You Use?

Quick guide:

• Simple HTTPS and routing → Caddy
• Maximum flexibility → NGINX
• Containers and Kubernetes → Traefik
• Extreme performance needs → HAProxy

These tools are often combined in real-world architectures rather than used alone.

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Final Thoughts

Reverse proxies are infrastructure fundamentals. The “best” choice depends on your scale, team, and operational complexity.

Understanding when to use each proxy is more important than mastering all of them.