code: def _parse_content_type_header(header):
      
  
      tokens = header.split(';')
      content_type, params = tokens[0].strip(), tokens[1:]
      params_dict = {}
      items_to_strip = "\"' "
  
      for param in params:
          param = param.strip()
          if param:
              key, value = param, True
              index_of_equals = param.find("=")
              if index_of_equals != -1:
                  key = param[:index_of_equals].strip(items_to_strip)
                  value = param[index_of_equals + 1:].strip(items_to_strip)
              params_dict[key.lower()] = value
      return content_type, params_dict
docs: Returns content type and parameters from given header
  
      :param header: string
      :return: tuple containing content type and dictionary of
           parameters