url

{% set url = url('<current>') %}

{% if 'reviews' in url|render|render %}
 <div class="reviews"></div>

Get file URL without domain /sites/default/files/import-xml/export_w0h_2.xml

$file = $this->entityTypeManager->getStorage('file')->load($fid);
$file_url = $file->createFileUrl();

Get file URL with domain and protocol

$file_url = $file->createFileUrl(FALSE);

$current_path = \Drupal::service('path.current')->getPath();