Using {host} as part of a log output filename

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{host} only exists when there’s an incoming HTTP request.

When Caddy starts, it needs to create a log file, but since there’s no HTTP request at that moment, there’s no {host} value available. In other words, {host} doesn’t exist yet during Caddy’s startup, so it can’t be used at that point.

@francislavoie clearly explains that here.

In the links you provided, they are using hardcoded values instead. So, in your case, you’d have to use somethign like this:

# ...

ha.[REDACT] homeassistant.[REDACT] {
	import rp {env.DUCKDNS_API_TOKEN} http://10.27.0.50:8123 ha.[REDACT]
}

# ...
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