code: async function runSample() {
    // the first query will return data with an etag
    const res = await getPlaylistData(null);
    const etag = res.data.etag;
    console.log(`etag: ${etag}`);
  
    // the second query will (likely) return no data, and an HTTP 304
    // since the If-None-Match header was set with a matching eTag
    const res2 = await getPlaylistData(etag);
    console.log(res2.status);
  }
docs: a very simple example of getting data from a playlist