nginx.conf

worker_processes 1;

events {
    worker_connections 1024;
}

http {
    include       mime.types;
    default_type  application/octet-stream;

    sendfile        on;
    keepalive_timeout 65;

    server {
        listen 5000;

        location / {
            root   /usr/share/nginx/html;
            index  index.html;
            try_files $uri /index.html;
        }

        location /backend/ {
            proxy_pass http://localhost:3000/backend/;
            rewrite ^/backend(/.*)$ $1 break;
            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;
        }
    }
}