code: def get_payload(self):
          
          temp = self.get_uri_as_list()
          query_string = temp[4]
          if query_string == "":
              return None  # Bad request error code
          query_string_as_list = str.split(query_string, "=")
          return query_string_as_list[1]
docs: Return the query string of the uri.
  
          :return: the query string as a list