code: def _serve_asset(self, path, gzipped_asset_bytes, request):
      
      mimetype = mimetypes.guess_type(path)[0] or 'application/octet-stream'
      return http_util.Respond(
          request, gzipped_asset_bytes, mimetype, content_encoding='gzip')
docs: Serves a pre-gzipped static asset from the zip file.