Custom Domain for Dropbox Public Directory

nginx.conf

server{ 
    listen 80; 
    server_name xxx.com; 

    location / { 
        set $index index.html;
        rewrite ^.*\/$ $fastcgi_script_name$index last;
        
        proxy_pass http://dl.dropbox.com/u/xxxxxxxx/; 
        proxy_redirect off; 
        proxy_set_header X-Real-IP $remote_addr; 
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; 
    } 
}