doesItAll.js

const query = `
CREATE TEMPORARY FUNCTION getHeaders(payload STRING)
RETURNS STRING
LANGUAGE js AS """
  try {
    var $ = JSON.parse(payload);
    var headers = $.response.headers;
    var st = headers.find(function(e) { 
      return e['name'].toLowerCase() === 'server-timing'
    });
    return st['value'];
  } catch (e) {
    return '';
  }
""";

SELECT * FROM 
  (SELECT url, getHeaders(payload) AS st FROM httparchive.har.2017_07_01_chrome_requests)
WHERE
  st != ""
`

ReactDOM.render(
  <HttpArchiveQuery query={query}><div>Hello, world</div></HttpArchiveQuery>,
  document.getElementById('root')
)