async function handleFetch(grid, url) {
  let response = await fetch(url)
  if (response.ok) {
    game = await response.json()
    // Update the HTML view.
    updateHtml(grid, game)
  }
  if (!response.ok) {
    await wait(500) // wait a little if there is connection trouble
  }
  if (!response.ok || game.state == "waiting" || game.state == "playing" && !game.myturn) {
    await handleFetch(grid, `longpoll`)  // longpoll to wait for state change
  }
}