Caddy vs. Nginx: The Reverse Proxy Decision Tree for Self-Hosters in 2026

When self-hosting open-source applications, setting up a reverse proxy is the first critical infrastructure hurdle. For more than two decades, Nginx has been the undisputed industry standard for web serving, SSL termination, and high-concurrency request routing.

However, in recent years, Caddy (caddyserver/caddy)—an open-source web server written in Go—has seen explosive adoption across self-hosting communities, homelabbers, and startup engineering teams. Caddy's signature feature is zero-configuration automated HTTPS: it manages certificate issuance, renewal, and OCSP stapling out of the box with zero external scripts.

Does Caddy eliminate the need for Nginx in modern infrastructure stacks, or does Nginx still hold the architectural crown when raw throughput and low resource overhead matter? This guide compares their internal architectures, configuration models, and real-world trade-offs with production-tested configurations.

1. Side-by-Side Comparison Matrix

2. Configuration Comparison: A Real-World Reverse Proxy

To understand the practical ergonomics, consider a standard homelab scenario: proxying traffic for a web service (e.g., Uptime Kuma or Nextcloud) running locally on port 3001 to status.example.com with SSL and WebSocket support.

The Nginx Way (42 Lines of Boilerplate)

With Nginx, you must manually specify SSL protocols, cipher suites, header forwarding, WebSocket upgrade maps, and certificate file paths:

map $http_upgrade $connection_upgrade {
    default upgrade;
    ''      close;
}

server {
    listen 80;
    server_name status.example.com;
    return 301 https://$host$request_uri;
}

server {
    listen 443 ssl;
    http2 on;
    server_name status.example.com;

    ssl_certificate /etc/letsencrypt/live/status.example.com/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/status.example.com/privkey.pem;
    ssl_protocols TLSv1.2 TLSv1.3;
    ssl_ciphers HIGH:!aNULL:!MD5;
    ssl_prefer_server_ciphers on;

    location / {
        proxy_pass http://127.0.0.1:3001;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection $connection_upgrade;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
    }
}

The Caddy Way (3 Lines of Clean Directives)

Here is the exact functional equivalent in a Caddyfile:

status.example.com {
    reverse_proxy 127.0.0.1:3001
}

Why is Caddy this concise? Caddy inspects the hostname (status.example.com), contacts Let's Encrypt via ACME, proves domain ownership on port 80, retrieves and stores certificates securely, sets up modern TLS 1.3 ciphers, enables HTTP/2 and HTTP/3 automatically, and transparently proxies WebSocket connections without manual upgrade headers.

3. Docker Compose Production Runbooks

Below are production-ready Docker Compose setups for deploying both reverse proxies alongside containerized services.

Deploying Caddy with Docker Compose

services:
  caddy:
    image: caddy:2.8-alpine
    container_name: caddy-proxy
    restart: unless-stopped
    ports:
      - "80:80"
      - "443:443"
      - "443:443/udp" # Required for HTTP/3 QUIC
    volumes:
      - ./Caddyfile:/etc/caddy/Caddyfile:ro
      - caddy_data:/data # Critical: Stores TLS certificates and private keys
      - caddy_config:/config
    networks:
      - proxy_net

volumes:
  caddy_data:
  caddy_config:

networks:
  proxy_net:
    external: true

4. The Decision Tree: Which Proxy Should You Choose?

Use this architectural decision tree to determine which proxy fits your workload:

Related Architecture & Developer Guides

• Self-Hosting Uptime Kuma: The Complete Production Guide (Docker Compose, Nginx & Caddy snippets).
• Coolify vs. Dokku vs. CapRover: Choosing a Self-Hosted PaaS in 2026 (Automated reverse proxy routing with Traefik and Caddy).
• How to Fix 'Docker: permission denied while trying to connect to the Docker daemon socket' (Fixing Linux container permissions).