minimal nginx config with CORS and COEP headers set

nginx.conf

daemon            off;

events {}

error_log /dev/stdout info;

http {
    include /usr/local/etc/nginx/mime.types;
    access_log /dev/stdout;
    server {
        listen       9000;

        location / {
          add_header Access-Control-Allow-Origin *;
          add_header 'Cross-Origin-Embedder-Policy' 'require-corp';
          add_header 'Cross-Origin-Opener-Policy' 'same-origin';

          root /path/to/html;
        }
    }
}