myip.dn42/nginx-config/myip.dn42-nginx.conf

server {
    listen 172.20.0.81:80;
    listen [fd42:d42:d42:81::1]:80;
    server_name myip.dn42;
    server_name *.myip.dn42;
    server_name 172.22.0.81;
    server_name [fd42:d42:d42:81::1];
    
    root /path/to/myip-wwwroot;
    index index.html;    

   location /raw {
         return 200 '$remote_addr\n';
         add_header Content-Type text/plain;
    }

    location = /api {
        keepalive_requests 0;
        default_type application/json;
        add_header 'Access-Control-Allow-Origin' '*';
        return 200 '{"version": "1.0", "ip": "$remote_addr", "server": "$server_addr","node_as": "<yourAS-without-AS>", "node_location": "<node country code>", "node_id": "<nodename or so>"}';
    }
    
    #location = / {
    #    
    #}


}