docs: def _api_args_item(self, item):
          """Glances API RESTful implementation.
  
          Return the JSON representation of the Glances command line arguments item
          HTTP/200 if OK
          HTTP/400 if item is not found
          HTTP/404 if others error
          """
          response.content_type = 'application/json; charset=utf-8'
  
          if item not in self.args:
              abort(400, "Unknown argument item %s" % item)
  
          try:
              # Get the JSON value of the args' dict
              # Use vars to convert namespace to dict
              # Source: https://docs.python.org/%s/library/functions.html#vars
              args_json = json.dumps(vars(self.args)[item])
          except Exception as e:
              abort(404, "Cannot get args item (%s)" % str(e))
          return args_json