avoid 400 bad request error if ssl is enabled and interface is accessed with http instead of https. Instead redirect to the requested page with https at the beginning of the URL.

According to FS#1982

Author: Bimon

install/tpl/nginx_ispconfig.vhost.master

@@ -1,8 +1,11 @@
 server {
         listen {vhost_port};
-	ssl {ssl_on};
+		ssl {ssl_on};
         {ssl_comment}ssl_certificate /usr/local/ispconfig/interface/ssl/ispserver.crt;
         {ssl_comment}ssl_certificate_key /usr/local/ispconfig/interface/ssl/ispserver.key;
+		
+		# redirect to https if accessed with http
+		{ssl_comment}error_page 497 https://$host:{vhost_port}$request_uri;
 
         server_name _;