def build_url_query(current_path, datum = nil)
      unless datum.nil?
        current_path += '?'
        current_path += URI.encode_www_form datum
      end
      current_path
    end
def build_url_query(current_path, datum = nil)
      unless datum.nil?
        current_path += '?'
        current_path += URI.encode_www_form datum
      end
      current_path
    end
build a get query
 @param [String] current_path the uri like /api/v1/foo
 @param [Hash] datum k,v hash of get query param and value