anchor.diff:  
   ./etc/nginx/nginx.conf
   
  -+
   ----
   
   user  nginx;
  
positive.code:     index   index.html index.htm;
  }
  ----
  +
  
  ./etc/nginx/conf.d/amos1.conf
  
  +
  ----
  upstream amos1 {
          server <server1>;
  
negative.code:         proxy_pass http://amos1;
      }
  }
  ----