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Web / Caddy Server Interview questions

List the certificate authorities Caddy can obtain TLS certificates from?

Caddy is not tied to a single CA - its automatic HTTPS is built on the ACME protocol, so it can work with any CA that speaks ACME, and it ships with sensible defaults out of the box.

CARole
Let's EncryptDefault primary CA for public certificates.
ZeroSSLDefault fallback CA if Let's Encrypt issuance fails.
Internal CA (tls internal)Caddy's own local CA for development and testing without a public domain.
Custom ACME CAAny ACME-compliant CA (e.g. a private enterprise CA) set via the acme_ca global option.

Switching CAs is usually one line, such as acme_ca https://acme.example.com/directory in the global options block, which is common in enterprises running an internal ACME server like step-ca.

Which directive is used for local/internal TLS during development?
Which CA does Caddy fall back to if Let's Encrypt issuance fails?

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