How to use the pywb.framework.wbrequestresponse.WbResponse.text_response function in pywb

content_type = self.YT_DL_TYPE
        metadata = json.dumps(info)

        if (self.recording and cache_key):
            headers = self._live_request_headers(wbrequest)
            headers['Content-Type'] = content_type

            if info_url.startswith('https://'):
                info_url = info_url.replace('https', 'http', 1)

            response = self.live_fetcher.add_metadata(info_url, headers, metadata)

            self._cache[cache_key] = '1'

        return WbResponse.text_response(metadata, content_type=content_type)

if err_msg and isinstance(err_msg, str):
                err_msg = to_native_str(err_msg, 'utf-8')

            return error_view.render_response(exc_type=type(exc).__name__,
                                              err_msg=err_msg,
                                              err_details=err_details,
                                              status=status,
                                              env=env,
                                              err_url=err_url)
        else:
            msg = status + ' Error: '
            if err_msg:
                msg += err_msg

            #msg = msg.encode('utf-8', 'ignore')
            return WbResponse.text_response(msg,
                                            status=status)

def check_single_url(self, wbrequest, perms_checker):
        urlkey = self.url_canon(wbrequest.wb_url.url)
        urlkey = urlkey.encode('utf-8')

        if not perms_checker.allow_url_lookup(urlkey):
            response_text = BLOCK
        else:
            response_text = ALLOW

        #TODO: other types of checking
        return WbResponse.text_response(response_text,
                                        content_type=RESPONSE_TYPE)
#TODO