HTTP vs HTTPS: what changes on your server
HTTP and HTTPS differ on the server side: a second listener, a redirect, HSTS you cannot easily undo, mixed content, and renewal that fails at 3am.
#certificates
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Add Your Own CA to Ubuntu's Trust Store
Create a private CA with openssl, sign a leaf certificate, then install the root in /usr/local/share/ca-certificates so Ubuntu trusts your internal HTTPS.