Built-In CODE behind reverse proxy problems

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Thank you for your answer.

I have tried to setup a dedicated Collabora container but I get the following error after inserting the following address into the office settings in Nextcloud https:://collabora.my.domain:

Your browser has been unable to connect to the Collabora server: http://collabora.ppflaum.ch

This URL is determined on the Collabora server either from the configured URL or the server_name parameter in coolwsd.xml.

I have used the following container setup:

[Container]
ContainerName=collabora-nextcloud
Pod=nextcloud.pod
Image=docker.io/collabora/code:latest
AutoUpdate=registry
Environment=domain=collabora.my.domain
Environment=server_name=collabora.my.domain
Environment=extra_params=--o:ssl.enable=false

[Unit]
After=nextcloud.pod
Requires=nextcloud.pod

[Service]
Restart=always

[Install]
WantedBy=default.target

I use the following Caddyfile for the reverse proxy:

{
    email my-address@proton.me
}

nextcloud.my.domain {
    reverse_proxy 127.0.0.1:8080 {
        header_up Host {host}
        header_up X-Real-IP {remote_ip}
        header_up X-Forwarded-For {remote_ip}
        header_up X-Forwarded-Proto {scheme}
    }
} 

collabora.my.domain {
    encode gzip 
    reverse_proxy 127.0.0.1:9980 {
        header_up Host {upstream_hostport}
        header_up X-Forwarded-For {remote_host}
        header_up X-Forwarded-Proto {scheme}
    }
}

I have read the reference Collabora integration guide but I am not an expert and I don’t see my mistake.