Attempt to make proxy sub-dir -> app no subdir work (#9317)

Set APP_URL and APP_URL_SUFFIX in .env

routes/web.php

@@ -11,6 +11,11 @@
 |
 */
 
+// handle proxy with subdirectory and app without
+if ($appUrl = trim(config('app.url'), '/')) {
+    \URL::forceRootUrl(str_finish(config('app.url'), '/') . config('app.url_suffix'));
+}
+
 // Auth
 Auth::routes();