I am trying to make Jquery Ajax call to a REST Service.The service excepts Basic authentication which requires User Name & Password. So, while making the Ajax request i have added the Authorization tag in the code.But still i don't see the Authorization tag after the request.

var username = "user";
var password = "pwd";

var url = 'mysite.com';
$.ajax({
    url: url,
    success: function(json) {
        alert("Success", json);
    },
    error: function(XMLHttpRequest, textStatus, errorThrown) {
       alert(textStatus, errorThrown);
    },

    //headers: {'Authorization': 'Basic bWFkaHNvbWUxMjM='},
    beforeSend: function (xhr) {
      xhr.setRequestHeader ("Authorization", "Basic " + btoa(username + ":" + password));
    },
    type: 'GET',
    contentType: 'json',
});