docs: def ro(self):
  		""" Return read-only copy of this object
  
  		:return: WHTTPHeaders
  		"""
  		ro_headers = WHTTPHeaders()
  		names = self.headers()
  		for name in names:
  			ro_headers.add_headers(name, *self.get_headers(name))
  		ro_headers.__cookies = self.__set_cookies.ro()
  		ro_headers.__ro_flag = True
  		return ro_headers