Caddy

Caddy Skill

The ultimate enterprise web server with automatic HTTPS.

Ecosystem Graph Preview

graph LR
  caddy["caddy"]:::core
  classDef core fill:#f9f,stroke:#333,stroke-width:4px;
  caddy -- "alternative to" --> nginx
  caddy -- "works well with" --> docker
  traefik -- "alternative to" --> caddy

Recommended Next Skills

• traefik (Score: 0.99) Why: Direct relationship, Both are Infrastructure, Shared ecosystem (devops), Can deploy to docker, Similar network profile, Logical next step
• nginx (Score: 0.98) Why: Direct relationship, Both are Infrastructure, Shared ecosystem (devops), Can deploy to docker, Similar network profile, Logical next step
• docker (Score: 0.87) Why: Direct relationship, Both are Infrastructure, Shared ecosystem (devops), Similar network profile, Logical next step

Quick Start

Caddy is a modern Go-based web server that completely automates TLS certificate generation and renewal via Let's Encrypt.

caddy run

Production Patterns

Automatic HTTPS

Unlike NGINX where you must configure certbot and cron jobs manually, Caddy handles the entire ACME challenge, certificate generation, and auto-renewal internally without any configuration beyond defining your domain name.

Architecture & Scaling

Caddyfile

The configuration syntax is drastically simpler than NGINX. A fully functional reverse proxy with automatic HTTPS is literally two lines of code.

Error Recovery

If Caddy fails to start due to port binding errors, ensure port 80 and 443 are free. Caddy MUST bind to port 80 to complete the HTTP-01 Let's Encrypt challenge.

Security Notes

Caddy is memory-safe since it's written in Go, eliminating entire classes of buffer overflow vulnerabilities present in older C-based servers.

References

• Caddy Docs

Why use this skill

Use this when your agent works with caddy — structured patterns beat pasted docs and prevent common hallucinations.

AI pitfalls

• Hardcoding region or account IDs
• Missing IAM least-privilege on cloud resources
• Confusing similar service names (e.g. S3 vs CloudFront)

Production checklist

• Secrets in environment variables, not source code
• Error handling and logging in place
• Rate limits and timeouts configured

Related skills

• nginx — alternative to
• docker — works well with

Last Verified: 2026-07-02