no caching to get the 404 floppy after ejected

etc/nginx/sites-available/default

@@ -11,6 +11,8 @@ server {
 
 	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;