Add Authentication details in the AJAX request in SAPUI5

Basically you need to exploit the beforeSend function of JQuery AJAX to sort out your requirement.

Here is a basic code snippet −

function AddToHeader(xhr) {
    var pwd = // get the password;
    xhr.setRequestHeader("Authorization", "Basic " + btoa(user + ":" + pwd));
}
$.ajax({
   type: "GET",
   url: <method url >,
   dataType: "JSON",
   beforeSend: function(xhr) {
      AddToHeader (xhr);
   }
}).done(function(data) { /* do success logic */ }

You can add further details to the header as explained in the AddToHeader method.