code: func (c *Client) DownloadRaw(hash string) (io.ReadCloser, bool, error) {
  	uri := c.Gateway + "/bzz-raw:/" + hash
  	res, err := http.DefaultClient.Get(uri)
  	if err != nil {
  		return nil, false, err
  	}
  	if res.StatusCode != http.StatusOK {
  		res.Body.Close()
  		return nil, false, fmt.Errorf("unexpected HTTP status: %s", res.Status)
  	}
  	isEncrypted := (res.Header.Get("X-Decrypted") == "true")
  	return res.Body, isEncrypted, nil
  }
docs: // DownloadRaw downloads raw data from swarm and it returns a ReadCloser and a bool whether the
  // content was encrypted