N°3671 - app_root_url: handle reverse proxies during the setup and preserve existing configuration during an upgrade.

core/config.class.inc.php

@@ -1265,6 +1265,14 @@ class Config
 			'source_of_value' => '',
 			'show_in_conf_sample' => false,
 		],
+		'trust_proxies' => [
+			'type' => 'bool',
+			'description' => 'If true, then proxies custom header (X-Forwarded-*) are taken into account. Use only if the webserver is not publicly accessible (reachable only by the reverse proxy)',
+			'default' => false,
+			'value' => false,
+			'source_of_value' => '',
+			'show_in_conf_sample' => false,
+		],
 	);