AVM FritzBox does not support https

[mhupfauer]

AVM FritzBox runs into SSL errors on update due to the missing CA used by LE.

Quick Workaround: Disable HTTPS in caddy http://{$DDNS_CADDY_DOMAIN}

However there is a option (I think) to disable the automatic 302 moved redirect: If the json config is used it should be possible to disable the automatic https redirect therefore enabling the usage by AVM devices. https://caddyserver.com/docs/json/apps/http/servers/automatic_https/