hassio-addons/maintainerr/rootfs/etc/nginx/servers/ingress.conf

server {
    listen %%interface%%:%%port%% default_server;
    include /etc/nginx/includes/server_params.conf;
    include /etc/nginx/includes/proxy_params.conf;

    proxy_buffering off;
    gzip_static off;
    client_max_body_size 0;

    # Based on https://docs.maintainerr.info/ReverseProxy/#nginx-subdomain
    location / {
        set $app '%%ingress_entry%%';

        rewrite ^%%ingress_entry%%/?(.*)$ /$1 break;
        proxy_pass http://127.0.0.1:6246;

        # WebSocket support
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";

        proxy_hide_header X-Powered-By;
        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;
        proxy_set_header Accept-Encoding "";
        proxy_read_timeout 90;
        add_header X-Frame-Options "SAMEORIGIN";
        add_header 'Referrer-Policy' 'no-referrer';

        # Redirect location headers
        absolute_redirect off;
        proxy_redirect / $app/;

        # Sub filters to rewrite URLs in responses
        sub_filter_once off;
        sub_filter_types *;

        # HTML attribute rewrites
        sub_filter 'href="/"' 'href="%%ingress_entry%%/"';
        sub_filter 'src="/' 'src="%%ingress_entry%%/';
        sub_filter 'action="/' 'action="%%ingress_entry%%/';

        # API path rewrites
        sub_filter '"/api' '"%%ingress_entry%%/api';
        sub_filter '`/api' '`%%ingress_entry%%/api';
        sub_filter "'/api" "'%%ingress_entry%%/api";

        # Vite asset rewrites
        sub_filter '"/assets' '"%%ingress_entry%%/assets';
        sub_filter '`/assets' '`%%ingress_entry%%/assets';
        sub_filter "'/assets" "'%%ingress_entry%%/assets";

        # Favicon and static files
        sub_filter '"/favicon' '"%%ingress_entry%%/favicon';
        sub_filter '"/logo' '"%%ingress_entry%%/logo';

        # Root path references in JavaScript
        sub_filter '"\/"' '"%%ingress_entry%%\/"';
    }
}