def add_headers(self, header_name, value, *values):
		""" Add new header

		:param header_name: name of the header to add
		:param value: header value
		:param values: additional header values (in a result request/response must be concatenated by the coma \
		or by the separate header string)
		:return: None
		"""
		if self.__ro_flag:
			raise RuntimeError('ro')
		header_name = self.normalize_name(header_name)
		if header_name not in self.__headers.keys():
			self.__headers[header_name] = [value]
		else:
			self.__headers[header_name].append(value)

		for single_value in values:
			self.__headers[header_name].append(single_value)
Add new header

		:param header_name: name of the header to add
		:param value: header value
		:param values: additional header values (in a result request/response must be concatenated by the coma \
		or by the separate header string)
		:return: None