Caddy
Caddy provides an open-source Go web server that configures HTTPS automatically.
About Caddy
Caddy is an open-source web server written in Go that obtains and renews TLS certificates automatically by default. It supports on-demand certificate provisioning during TLS handshakes for customer-owned domains, serves localhost and internal addresses over HTTPS using a self-managed local certificate authority, and can define multiple CAs and act as an ACME server for internal PKI. Configuration uses JSON with a RESTful config API, and multiple instances using the same storage can coordinate certificate management.
The public hosted demo is intentionally restricted. It requires a public DNS record for a subdomain named caddydemo, allows time for propagation, and requires a client that sends TLS ServerName indication.
Key features
- Automatically obtains and renews TLS certificates by default
- On-demand TLS provisioning during TLS handshakes for custom domains
- Serves localhost and internal IPs over HTTPS via local CA
- Define multiple CAs and run ACME server for internal PKI
- JSON configuration manageable through RESTful config API
- Multiple instances coordinate certificate management with shared storage
Best for: Operators and SaaS teams managing many sites or customer-owned domains that need automated certificates.
Good for
- Obtains and renews certificates automatically by default
- Supports on-demand certificates for customer-owned domains
- Open source with public code repository
Watch out for
- Hosted demo only works with direct caddydemo subdomains
- Demo requires DNS setup, propagation time, and TLS ServerName support
- Local HTTPS use involves installing root in local trust stores
Caddy at a glance
- Website
- caddyserver.com
- Category
- Development › Cloud & Web Hosting
- Type
- Online tool
- Pricing
- Not confirmed. Check the site
- Platforms
- Web
- Open source
- Yes · Source code
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
Guides for Cloud & Web Hosting
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Caddy FAQ
How can I try the hosted demo?
Point DNS records for a subdomain named caddydemo to demo.caddyserver.com via CNAME, or to 138.68.4.62 and 2604:a880:2:d0::9dd:9001 via A and AAAA records, then visit it in a browser.
Why is the demo not working?
Use a direct subdomain of a registered domain, not a sub-subdomain, verify the DNS records, allow time for propagation, and use a client that sets TLS ServerName indication.
How does Caddy handle localhost and internal addresses?
It serves them over HTTPS using a locally-trusted certificate authority with short-lived, auto-renewing certificates, and can install the root into local trust stores.
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