For production usage please use a proxy server like NginX to handle certificate support.
Add certificates for port 443.
For accessing application create a location command like this:
location cockpit{
proxy_pass http://127.0.0.1:6001;
proxy_cache_bypass $http_upgrade;
proxy_set_header Host $host;
proxy_http_version 1.1;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection keep-alive;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
client_max_body_size 10m;
proxy_read_timeout 180;
}