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var Observable = Rx.Observable;
function mockHTTPRequest(url) {
  if (url == 'url-3') {
    return Observable.throw(new Error(`Request ${url} failed.`));
  } else {
    return Observable.of(`Response from ${url}`)
      .delay(1000);
  }
}
let urls = ['url-1', 'url-2', 'url-3', 'url-4'];
let start = (new Date()).getTime();
Observable.from(urls)
  .concatMap(url => mockHTTPRequest(url))
  .timestamp()
  .map(stamp => [stamp.timestamp - start, stamp.value])
  .subscribe(val => console.log(val), error => console.log('error: ' + error));
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