Nginx到底是怎么转发的

location /dev-api/wms-order/api/screen/byq/ {
        add_header          'Access-Control-Allow-Origin' '*';
        add_header          'Access-Control-Allow-Credentials' 'true';
        add_header          'Access-Control-Allow-Methods' 'OPTIONS, GET, POST';
        proxy_pass          http://182.44.16.68:8099/wms-order/api/screen/;
        proxy_connect_timeout       300s;
        proxy_send_timeout  300s;
        proxy_read_timeout  300s;
        proxy_set_header    Host             $host;
        proxy_set_header    X-Real-IP        $remote_addr;
        proxy_set_header    X-Forwarded-For  $proxy_add_x_forwarded_for;
      }