-root/111/content.csv
-root/112/content.csv
-root/113/content.csv
-root/114/content.csv

server {
    listen 80;
    location /download/ {
        alias /home/root/111/conent.csv;
    }
}

server {
    listen 80;
    location /download/ {
        root /home/root/;
        rewrite /download/(.*)$ /$1/content.cvs break;
    }
}