diff --git a/README.md b/README.md
index 16920a1..1ddb652 100644
--- a/README.md
+++ b/README.md
@@ -115,6 +115,12 @@ Ldap attribute for the email.
 ## LDAP_UID_ATTRIBUTE
 Ldap attribute for the user id.
 
+## ASSUME_HTTPS
+- default: on
+The value of `fastcgi_param HTTPS`.
+
+Either `on` or `off`.
+
 # Ports
 - 80
 
diff --git a/rootfs/etc/confd/templates/nextcloud.conf.tmpl b/rootfs/etc/confd/templates/nextcloud.conf.tmpl
index 36aef88..46f46df 100644
--- a/rootfs/etc/confd/templates/nextcloud.conf.tmpl
+++ b/rootfs/etc/confd/templates/nextcloud.conf.tmpl
@@ -61,7 +61,7 @@ server {
         include fastcgi_params;
         fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
         fastcgi_param PATH_INFO $fastcgi_path_info;
-        fastcgi_param HTTPS on;
+        fastcgi_param HTTPS {{ getenv "ASSUME_HTTPS" "on" }};
 
         #Avoid sending the security headers twice
         fastcgi_param modHeadersAvailable true;