no caching to get the 404 floppy after ejected

etc/nginx/sites-available/default

@@ -10,7 +10,9 @@ server {
 	server_name _;
 
 	error_page 404 /404-floppy-not-found.html;
-        
+
+	add_header Cache-Control no-cache;
+    
 	location = /404-floppy-not-found.html {
                 root /var/www/static;
                 internal;