I make a JSONP request using MooTools:
var username = 'hsz';
var password = 'pass';
var req = new Request.JSONP({
    url: 'http://api.blip.pl/profile.json',
    method: 'get',
    headers: {
        'Authorization' : 'Basic ' + Base64.encode(username + ':' + password),
        'Accept'        : 'application/json',
        'Content-Type'  : 'application/json',
        'X-blip-api'    : '0.02'
    },
    onSuccess: function(res){ alert('success'); },
    onFailure: function(res){ alert('failure'); }
}).send();
With valid login and password it works fine (alerts me success).
When I change password to an invalid value it does not do anything.
I do not know why it behaves badly.
Same thing when I use Request.JSON().
Any ideas ?