Glances API RESTful implementation.

        Return the help data or 404 error.

def _api_help(self):
        """Glances API RESTful implementation.

        Return the help data or 404 error.
        """
        response.content_type = 'application/json; charset=utf-8'

        # Update the stat
        view_data = self.stats.get_plugin("help").get_view_data()
        try:
            plist = json.dumps(view_data, sort_keys=True)
        except Exception as e:
            abort(404, "Cannot get help view data (%s)" % str(e))
        return plist