diff --git a/roles/setup_http_site_proxy/templates/apache-docker-proxy-site.j2 b/roles/setup_http_site_proxy/templates/apache-docker-proxy-site.j2
index a57db73..a3adea8 100644
--- a/roles/setup_http_site_proxy/templates/apache-docker-proxy-site.j2
+++ b/roles/setup_http_site_proxy/templates/apache-docker-proxy-site.j2
@@ -44,6 +44,7 @@
     ProxyPass / http://{{ backend_host | default("localhost") }}:{{proxy_port}}/ nocanon
     RequestHeader set "X-Forwarded-Proto" expr=%{REQUEST_SCHEME}
     RequestHeader set "X-Forwarded-SSL" expr=%{HTTPS}
+    ProxyPreserveHost {{ proxy_preserve_host | default("Off") }}
 
     <ifmodule mod_rewrite.c>
         # see documentation of wstunnel: This allwos generic websocket passthrough