upstream domain {
    server 127.0.0.1:8002;
}

server {

    listen 80;
    server_name <example.com>;
    client_max_body_size 10M;
    keepalive_timeout    15;

server {

    listen 80;
    server_name <different_name>;
    client_max_body_size 10M;
    keepalive_timeout    15;

server {
    listen      80 default_server;
    server_name _ ;
    return 503  "No server is currently configured for the requested host."
}