alue1 = xhr1.getResponseHeader(name1);
  var value2 = xhr1.getResponseHeader(name2);
  var value3 = xhr1.getResponseHeader(name3);

  var supportsCaseInsensitiveHeaders =
    value1 != null && value2 != null && value3 != null &&
    value1 === value2 && value2 === value3;

  var result =
    name1 + ': ' + value1 + '\n' +
    name2 + ': ' + value2 + '\n' +
    name3 + ': ' + value3 + '\n\n' +
    'Supports case insensitive headers: ' + supportsCaseInsensitiveHeaders;

  document.getElementById('result-1').i