docs: def tonicdns_client(uri, method, token='', data='', keyword='',
                      content='', raw_flag=False):
      """TonicDNS API client
  
      Arguments:
  
          uri:      TonicDNS API URI
          method:   TonicDNS API request method
          token:    TonicDNS API authentication token
          data:     Post data to TonicDNS API
          keyword:  Processing keyword of response
          content:  data exist flag
          raw_flag: True is return response data, False is pretty printing
      """
      res = request(uri, method, data, token)
      if token:
          if keyword == 'serial':
              args = {"token": token, "keyword": keyword, "content": content}
              cur_soa, new_soa = response(uri, method, res, **args)
              return cur_soa, new_soa
  
          else:
              if content is None:
                  args = {"token": token, "keyword": keyword,
                          "content": content.get('domain')}
                  response(uri, method, res, **args)
              else:
                  # get sub command
                  args = {"token": token, "keyword": keyword,
                          "raw_flag": raw_flag}
                  data = response(uri, method, res, **args)
                  return data
  
      else:
          args = {"token": token, "keyword": keyword}
          token = response(uri, method, res, **args)
          return token