All I did was:
wget https://wordpress.org/latest.tar.gz
#tar xvf latest.tar.gz -C /home/joe/volumes/swag/www/wordpress/
made change into the default file here:
/home/joe/volumes/swag/nginx/site-confs
root /config/www/wordpress;
And everything works, only Client IP is always the IP of the SWAG container, internal IP( 10.89.0.3).