code: def set_error_page(self, status, html_fpath):
          
          statuses = [403, 404, 500]
  
          status = int(status)
  
          if status not in statuses:
              raise ConfigurationError(
                  'Code `%s` for `routing.set_error_page()` is unsupported. Supported: %s' %
                  (status, ', '.join(map(str, statuses))))
  
          self._set('error-page-%s' % status, html_fpath, multi=True)
  
          return self._section
docs: Add an error page (html) for managed 403, 404, 500 response.
  
          :param int status: HTTP status code.
  
          :param str|unicode html_fpath: HTML page file path.