add alternate path for use case of users embedding form elements directly in pages

src/Controller/RoblibSearchController.php

@@ -3,6 +3,8 @@
 namespace Drupal\roblib_search\Controller;
 
 use Drupal\Core\Controller\ControllerBase;
+use \Drupal\Core\Url;
+use Symfony\Component\HttpFoundation\RedirectResponse;
 
 /**
  * Controller for d3 graphs.
@@ -16,6 +18,10 @@ class RoblibSearchController extends ControllerBase {
    *   A renderable array.
    */
   public function searchResults($query = NULL) {
+    if ($query = $_GET['roblib_query']) {
+      $url = Url::fromRoute('roblib_search.landing_page', ['query' => $query]);
+      return new RedirectResponse($url->toString());
+    }
      return [
       '#theme' => 'roblib_search_results',
       '#query' => $query,