diff --git a/scripts/_common.sh b/scripts/_common.sh
index c6dfc0d..1f9842d 100755
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -48,7 +48,7 @@ install_source() {
             a=${a//'.'/'\.'}
             a=${a//'*'/'\*'}
         }
-        
+
         # We get the part witch we need to patch and create a regular expression
         a='case"start_login":this.setStateForNewView({view:unnamed_object.LOGIN}),this.notifyNewScreen("login");break;'
         escape_string
@@ -68,65 +68,3 @@ set_permission() {
     chown www-data:$app -R $final_path
     chmod u=rX,g=rX,o= -R $final_path
 }
-
-
-# Create a dedicated nginx config
-#
-# usage: ynh_add_nginx_config "list of others variables to replace"
-#
-# | arg: list of others variables to replace separeted by a space
-# |      for example : 'path_2 port_2 ...'
-#
-# This will use a template in ../conf/nginx.conf
-#   __PATH__      by  $path_url
-#   __DOMAIN__    by  $domain
-#   __PORT__      by  $port
-#   __NAME__      by  $app
-#   __FINALPATH__ by  $final_path
-#
-#  And dynamic variables (from the last example) :
-#   __PATH_2__    by $path_2
-#   __PORT_2__    by $port_2
-#
-ynh_add_nginx_config () {
-	local finalnginxconf="/etc/nginx/conf.d/$domain.d/$app.conf"
-	local others_var=${1:-}
-	ynh_backup_if_checksum_is_different "$finalnginxconf"
-	sudo cp ../conf/nginx.conf "$finalnginxconf"
-
-	# To avoid a break by set -u, use a void substitution ${var:-}. If the variable is not set, it's simply set with an empty variable.
-	# Substitute in a nginx config file only if the variable is not empty
-	if test -n "${path_url:-}"; then
-		# path_url_slash_less is path_url, or a blank value if path_url is only '/'
-		local path_url_slash_less=${path_url%/}
-		ynh_replace_string "__PATH__/" "$path_url_slash_less/" "$finalnginxconf"
-		ynh_replace_string "__PATH__" "$path_url" "$finalnginxconf"
-	fi
-	if test -n "${domain:-}"; then
-		ynh_replace_string "__DOMAIN__" "$domain" "$finalnginxconf"
-	fi
-	if test -n "${port:-}"; then
-		ynh_replace_string "__PORT__" "$port" "$finalnginxconf"
-	fi
-	if test -n "${app:-}"; then
-		ynh_replace_string "__NAME__" "$app" "$finalnginxconf"
-	fi
-	if test -n "${final_path:-}"; then
-		ynh_replace_string "__FINALPATH__" "$final_path" "$finalnginxconf"
-	fi
-
-	# Replace all other variable given as arguments
-	for v in $others_var
-	do
-        ynh_replace_string "__${v^^}__" "${!v}" "$finalnginxconf"
-	done
-	
-    if [ "${path_url:-}" != "/" ]
-    then
-        ynh_replace_string "^#sub_path_only" "" "$finalnginxconf"
-    fi
-
-	ynh_store_file_checksum "$finalnginxconf"
-
-	sudo systemctl reload nginx
-}
diff --git a/scripts/backup b/scripts/backup
index 82efe6a..09186fa 100644
--- a/scripts/backup
+++ b/scripts/backup
@@ -11,6 +11,7 @@ source /usr/share/yunohost/helpers
 ynh_abort_if_errors
 
 # Import common cmd
+source ../settings/scripts/experimental_helper.sh
 source ../settings/scripts/_common.sh
 
 #=================================================
diff --git a/scripts/change_url b/scripts/change_url
index ae00ec5..e233f5d 100644
--- a/scripts/change_url
+++ b/scripts/change_url
@@ -11,6 +11,7 @@ source /usr/share/yunohost/helpers
 ynh_abort_if_errors
 
 # Import common cmd
+source ./experimental_helper.sh
 source ./_common.sh
 
 # Retrive arguments
@@ -28,9 +29,9 @@ then
     # Delete file checksum for the old conf file location
     ynh_delete_file_checksum "/etc/nginx/conf.d/$old_domain.d/$app.conf"
 
-    mv "$old_file_path" "$new_file_path"
+    mv "/etc/nginx/conf.d/$old_domain.d/$app.conf" "/etc/nginx/conf.d/$domain.d/$app.conf"
 
     # Store file checksum for the new config file location
     ynh_store_file_checksum "/etc/nginx/conf.d/$domain.d/$app.conf"
 fi
-ynh_add_nginx_config
\ No newline at end of file
+ynh_add_nginx_config
diff --git a/scripts/experimental_helper.sh b/scripts/experimental_helper.sh
new file mode 100644
index 0000000..b69724a
--- /dev/null
+++ b/scripts/experimental_helper.sh
@@ -0,0 +1,72 @@
+# Delete a file checksum from the app settings
+#
+# $app should be defined when calling this helper
+#
+# usage: ynh_remove_file_checksum file
+# | arg: file - The file for which the checksum will be deleted
+ynh_delete_file_checksum () {
+	local checksum_setting_name=checksum_${1//[\/ ]/_}	# Replace all '/' and ' ' by '_'
+	ynh_app_setting_delete $app $checksum_setting_name
+}
+
+
+# Create a dedicated nginx config
+#
+# usage: ynh_add_nginx_config "list of others variables to replace"
+#
+# | arg: list of others variables to replace separeted by a space
+# |      for example : 'path_2 port_2 ...'
+#
+# This will use a template in ../conf/nginx.conf
+#   __PATH__      by  $path_url
+#   __DOMAIN__    by  $domain
+#   __PORT__      by  $port
+#   __NAME__      by  $app
+#   __FINALPATH__ by  $final_path
+#
+#  And dynamic variables (from the last example) :
+#   __PATH_2__    by $path_2
+#   __PORT_2__    by $port_2
+#
+ynh_add_nginx_config () {
+	local finalnginxconf="/etc/nginx/conf.d/$domain.d/$app.conf"
+	local others_var=${1:-}
+	ynh_backup_if_checksum_is_different "$finalnginxconf"
+	sudo cp ../conf/nginx.conf "$finalnginxconf"
+
+	# To avoid a break by set -u, use a void substitution ${var:-}. If the variable is not set, it's simply set with an empty variable.
+	# Substitute in a nginx config file only if the variable is not empty
+	if test -n "${path_url:-}"; then
+		# path_url_slash_less is path_url, or a blank value if path_url is only '/'
+		local path_url_slash_less=${path_url%/}
+		ynh_replace_string "__PATH__/" "$path_url_slash_less/" "$finalnginxconf"
+		ynh_replace_string "__PATH__" "$path_url" "$finalnginxconf"
+	fi
+	if test -n "${domain:-}"; then
+		ynh_replace_string "__DOMAIN__" "$domain" "$finalnginxconf"
+	fi
+	if test -n "${port:-}"; then
+		ynh_replace_string "__PORT__" "$port" "$finalnginxconf"
+	fi
+	if test -n "${app:-}"; then
+		ynh_replace_string "__NAME__" "$app" "$finalnginxconf"
+	fi
+	if test -n "${final_path:-}"; then
+		ynh_replace_string "__FINALPATH__" "$final_path" "$finalnginxconf"
+	fi
+
+	# Replace all other variable given as arguments
+	for v in $others_var
+	do
+        ynh_replace_string "__${v^^}__" "${!v}" "$finalnginxconf"
+	done
+	
+    if [ "${path_url:-}" != "/" ]
+    then
+        ynh_replace_string "^#sub_path_only" "" "$finalnginxconf"
+    fi
+
+	ynh_store_file_checksum "$finalnginxconf"
+
+	sudo systemctl reload nginx
+}
diff --git a/scripts/install b/scripts/install
index a9c7c9f..4f926c1 100644
--- a/scripts/install
+++ b/scripts/install
@@ -11,6 +11,7 @@ source /usr/share/yunohost/helpers
 ynh_abort_if_errors
 
 # Import common cmd
+source ./experimental_helper.sh
 source ./_common.sh
 
 # Retrieve arguments
diff --git a/scripts/remove b/scripts/remove
index dba4b21..fb4fec3 100755
--- a/scripts/remove
+++ b/scripts/remove
@@ -8,6 +8,7 @@
 source /usr/share/yunohost/helpers
 
 # Import common cmd
+source ./experimental_helper.sh
 source ./_common.sh
 
 #=================================================
diff --git a/scripts/restore b/scripts/restore
index b129c41..2817d89 100644
--- a/scripts/restore
+++ b/scripts/restore
@@ -11,6 +11,7 @@ source /usr/share/yunohost/helpers
 ynh_abort_if_errors
 
 # Import common cmd
+source ../settings/scripts/experimental_helper.sh
 source ../settings/scripts/_common.sh
 
 # Retrieve arguments
diff --git a/scripts/upgrade b/scripts/upgrade
index 0bd1000..0ec95fb 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -11,6 +11,7 @@ source /usr/share/yunohost/helpers
 ynh_abort_if_errors
 
 # Import common cmd
+source ./experimental_helper.sh
 source ./_common.sh
 
 # Retrieve arguments