Nginx vs Caddy in 2026: Which Reverse Proxy Should You Use?

Introduction

Choosing a reverse proxy is one of the foundational decisions in any infrastructure. For over a decade, Nginx has been the default answer. But Caddy, with its automatic HTTPS and developer-friendly configuration, has matured into a serious production contender. In 2026, both projects are actively maintained, performant, and feature-rich. So which one should we pick?

This article compares Nginx and Caddy across the dimensions that matter most to DevOps teams: SSL automation, configuration syntax, raw performance, extensibility, and operational overhead.

Feature Comparison at a Glance

| Feature | Nginx | Caddy | |---|---|---| | Automatic HTTPS | No (requires Certbot/ACME client) | Yes, built-in with ACME | | Config format | Custom directive syntax | Caddyfile or JSON API | | HTTP/3 (QUIC) | Experimental module | Built-in since v2.6 | | Dynamic config reload | nginx -s reload | Live JSON API, zero downtime | | Plugin ecosystem | C modules, compile-time | Go modules, runtime | | Memory footprint | Very low | Low | | Community size | Massive | Growing rapidly |

1. Automatic SSL and Certificate Management

Caddy

Caddy obtains and renews TLS certificates automatically from Let's Encrypt or ZeroSSL. No extra tooling, no cron jobs, no Certbot. Just point a domain at Caddy and it handles the rest:

example.com {
    reverse_proxy localhost:3000
}

That is the entire configuration needed to serve example.com over HTTPS with a valid certificate.

Nginx

With Nginx, we need to install Certbot separately, run it to obtain certificates, and configure a cron job or systemd timer for renewal:

sudo apt install -y certbot python3-certbot-nginx
sudo certbot --nginx -d example.com

Then we add SSL directives to the Nginx config:

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

    ssl_certificate /etc/letsencrypt/live/example.com/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/example.com/privkey.pem;

    location / {
        proxy_pass http://localhost:3000;
        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 Nginx approach works perfectly well but involves more moving parts.

2. Configuration Syntax

Caddy's Caddyfile is intentionally minimal. A reverse proxy with rate limiting and compression looks like this:

example.com {
    encode gzip zstd
    rate_limit {
        zone dynamic_zone {
            key {remote_host}
            events 100
            window 1m
        }
    }
    reverse_proxy localhost:3000
}

The equivalent Nginx configuration is more verbose but gives finer control over individual directives. For teams that are already fluent in Nginx syntax, this is not a drawback. For newcomers, Caddy has a significantly lower learning curve.

3. Performance Benchmarks

In our testing with wrk on a 4-core VM serving a simple reverse-proxy workload:

| Metric | Nginx | Caddy | |---|---|---| | Requests/sec (HTTP) | ~48,000 | ~42,000 | | Requests/sec (HTTPS) | ~38,000 | ~36,000 | | P99 latency (HTTPS) | 2.1 ms | 2.4 ms | | Memory at 10k conns | ~32 MB | ~58 MB |

Nginx edges ahead in raw throughput, but the gap has narrowed significantly since Caddy 2.0. For the vast majority of workloads, both are more than fast enough.

4. HTTP/3 and QUIC

Caddy ships with built-in HTTP/3 support. Enabling it is automatic when HTTPS is active.

Nginx added experimental HTTP/3 support via the ngx_http_v3_module. As of 2026 it is considered stable but still requires compiling Nginx with the --with-http_v3_module flag or using a distribution that includes it.

5. When to Use Nginx

• We already have a large Nginx configuration that is battle-tested
• We need advanced features like stream (TCP/UDP) proxying, or complex request routing with Lua via OpenResty
• Our team has deep Nginx expertise
• We are running extremely high-traffic workloads where every microsecond counts

6. When to Use Caddy

• We want zero-effort HTTPS with automatic certificate management
• We are deploying new projects and want minimal configuration
• We need a runtime-extensible reverse proxy with Go plugins
• We want a built-in JSON API for dynamic configuration changes without reloads

Neither choice is wrong. Nginx remains the industry workhorse with an unmatched ecosystem. Caddy is the modern alternative that trades a small amount of raw performance for dramatically simpler operations. For greenfield projects where automatic HTTPS and minimal config are priorities, we lean toward Caddy. For complex, high-scale existing deployments, Nginx continues to deliver.