Oboe headers

test.js

    oboe({
      url     : 'http://localhost:3000',
      method  : 'GET',
      headers : { "Cookie": document.cookie },
    });
    oboe({
      url     : 'http://localhost:3000',
      method  : 'GET',
      headers : { "Cookie": "test" },
    });
    oboe({
      url     : 'http://localhost:3000',
      method  : 'GET',
      headers : { "Cookie": "test", "foo": "bar" }, // Request header field foo is not allowed by Access-Control-Allow-Headers
    });
    $.get('http://localhost:3000'); // works