Confused about TLS-ALPN-01 Authorization Type for Certbot

As a sidenote, for security reasons, DNS-01 is best implemented by delegating the _acme-challenge DNS record onto a secondary DNS server. The acme-dns (GitHub - joohoi/acme-dns: Limited DNS server with RESTful HTTP API to handle ACME DNS challenges easily and securely.) project was designed to support this.

I believe acme.sh also supports TLS-ALPN-01

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