Merge pull request #144 from froboy/patch-1

fix: Ensure alert redirect respects base_path

src/Plugin/rest/resource/AlertsRestResource.php

@@ -223,7 +223,11 @@ public function get() {
 
     if ($language && !$request_language || $request_language && $request_language->getId() != $alert_language) {
       // Redirect to the same request URL with the language code added after the basePath.
-      $redirectUrl = $this->request->getSchemeAndHttpHost() . '/' . $langcode . $this->request->getRequestUri();
+      $base_path = $this->request->getBasePath();
+      $redirectUrl = $this->request->getSchemeAndHttpHost()
+        . $base_path . '/'
+        . $langcode
+        . str_replace($base_path, '', $this->request->getRequestUri()) ;
       // Sets the HTTP Status code to 303 - See Other.
       $response = new ModifiedResourceResponse(NULL, 303);
       $response->headers->set('Location', $redirectUrl);