docs: def get_static(self, _, file_name=None):
          """
          Get static content for UI.
          """
          content_type = {
              'ss': 'text/css',
              'js': 'application/javascript',
          }.get(file_name[-2:])
          if not content_type:
              raise HttpError(HTTPStatus.NOT_FOUND, 42)
  
          return HttpResponse(self.load_static(file_name), headers={
              'Content-Type': content_type,
              'Content-Encoding': 'gzip',
              'Cache-Control': 'public, max-age=300',
          })