code: func (c *Client) blobPrefix() (string, error) {
  	pfx, err := c.prefix()
  	if err != nil {
  		return "", err
  	}
  	if !c.isSharePrefix {
  		pfx += "/camli"
  	}
  	return pfx, nil
  }
docs: // blobPrefix returns the URL prefix before the blobref hash.
  // Example: http://foo.com:3179/bs/camli or http://foo.com:3179/share