Headers object transforming headers cases

headers-test.js

var headers = new Headers();
headers.append('Authorization', 'Basic abc');
headers.append('Connection', 'close');

var message = '';
for(var header of headers) {
  message += header[0] + ': ' + header[1] + '\n';
}

var testConstruct = 'Authorization: Basic abc\n';
testConstruct += 'Connection: close\n';
console.assert(message === testConstruct, 'Headers are not the same.')