http {
  server {
    server_name your.server.url;

    location /yourService1 {
      proxy_pass http://localhost:80;
      rewrite ^/yourService1(.*)$ $1 break;
    }

    location /yourService2 {
      proxy_pass http://localhost:5000;
      rewrite ^/yourService1(.*)$ $1 break;
    }
  }

  server {
    server_name another.server.url;

    location /yourService1 {
      proxy_pass http://localhost:80;
      rewrite ^/yourService1(.*)$ $1 break;
    }

    location /yourService3 {
      proxy_pass http://localhost:5001;
      rewrite ^/yourService1(.*)$ $1 break;
    }
  }
}