FIX_OPTIONS_ROUTE_ADDED_4_CORS

app/Config/Routes.php

@@ -3,6 +3,13 @@
 use CodeIgniter\Router\RouteCollection;
 
 
+
+// Allow OPTIONS for all routes
+$routes->options('(:any)', function() {
+    // This will never be called because the CORS filter returns early
+    // But having this route ensures OPTIONS isn't rejected as 404
+});
+
 /**
  * @var RouteCollection $routes
  */