docs: def send_file(self, filename, restricted=True, mimetype=None,
                    trusted=False, chunk_size=None, as_attachment=False,
                    **kwargs):
          """Send file to client."""
          return self.storage(**kwargs).send_file(
              filename,
              mimetype=mimetype,
              restricted=restricted,
              checksum=self.checksum,
              trusted=trusted,
              chunk_size=chunk_size,
              as_attachment=as_attachment,
          )