vHost-file (nginx)

git.YOURDOMAIN.COM.vhost

server {
    listen 443 ssl http2;
    listen [::]:443 ssl http2;

    server_name git.YOURDOMAIN.COM;

    ssl on;

    ssl_certificate /etc/letsencrypt/live/YOURDOMAIN.COM/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/YOURDOMAIN.COM/privkey.pem;

    add_header Strict-Transport-Security max-age=31536000;
    add_header X-Frame-Options DENY;

    expires -1;

    client_max_body_size 30M;

    location / {
        proxy_set_header        Host $host;
        proxy_set_header        X-Real-IP $remote_addr;
        proxy_set_header        X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header        X-Forwarded-Proto $scheme;
        allow all;
        proxy_pass              http://localhost:3000/;
        proxy_redirect          http://localhost:3000 https://git.YOURDOMAIN.COM;
    }
}