Caddy gains adoption over Nginx through automated TLS management

The web server landscape is seeing a shift toward Caddy as an alternative to the long-standing Nginx standard, primarily driven by Caddy's native automation of TLS certificate management.

Caddy utilizes the ACME protocol to automatically manage certificates through providers like Let's Encrypt and ZeroSSL. It supports various validation methods, including HTTP challenges, TLS-ALPN challenges, and DNS challenges. For local environments, Caddy can generate its own certificate authority using Smallstep libraries. This built-in automation contrasts with Nginx, which typically requires external tools such as Certbot and manual cron jobs to handle certificate renewals.

Technically, Caddy is written in Go, offering memory safety and a human-friendly configuration via the Caddyfile or a REST API. Nginx is written in C, providing direct memory control and high concurrency through an asynchronous event-driven architecture. While Nginx is noted for lower idle RAM usage, Caddy is gaining traction for its ease of configuration, native HTTP/3 support, and reduced operational overhead in modern DevOps and self-hosting environments.