From 36684dcf752c761f02bc85c6513db81e6482facd Mon Sep 17 00:00:00 2001
From: Jesse Norell <jesse@kci.net>
Date: Wed, 10 Oct 2018 18:37:08 +0200
Subject: [PATCH] Mulitple HSTS headers are not allowed, should either unset
 before adding new, or set conditionally.

---
 install/tpl/apache_ispconfig.vhost.master | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/install/tpl/apache_ispconfig.vhost.master b/install/tpl/apache_ispconfig.vhost.master
index 8eccbcba3..57c70885d 100644
--- a/install/tpl/apache_ispconfig.vhost.master
+++ b/install/tpl/apache_ispconfig.vhost.master
@@ -88,7 +88,7 @@ NameVirtualHost *:<tmpl_var name="vhost_port">
   </tmpl_if>
 
   <IfModule mod_headers.c>
-    Header always add Strict-Transport-Security "max-age=15768000"
+    Header setifempty add Strict-Transport-Security "max-age=15768000"
 	RequestHeader unset Proxy early
   </IfModule>
 
-- 
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