ka_nginx_2.conf

 events {
    worker_connections  1024;
}

http {
    keepalive_timeout  65;
    
    server {
        listen 80;
        location / {
            proxy_pass http://api_server;
            proxy_http_version 1.1;
            proxy_set_header Connection "";
            proxy_set_header Host $host;
        }
    }

    upstream api_server { 
        server host.docker.internal:3000; 
        keepalive 64; 
    }
}