# Example request: http://media1.nguoiduatin.vn/thumb_x680x354/media/bui-the-anh/2017/12/14/tien-le-qua-bot-ql5.jpg
# /thumb_x680x354 se duoc match theo regular expression
location /thumb {
        # alias /home/nguoiduatin/media/resize;
        if (!-e $request_filename) {
                rewrite ^/thumb_x([0-9]+)x/(.*)\.(.*) /gen_thumb_xxx.php?path=$2&w=$1&h=0&ex=$3 last;
                rewrite ^/thumb_x([0-9]+)x([0-9]+)/(.*)\.(.*) /gen_thumb_xxx.php?path=$3&w=$1&h=$2&ex=$4 last;
                rewrite ^/thumb_xx([0-9]+)/(.*)\.(.*) /gen_thumb_xxx.php?path=$2&w=0&h=$1&ex=$3 last;
        }

        if (-e $request_filename) {
                expires max;
                add_header Cache-Control public;
        }
}