I discovered the problem, I commented the lines followings and now works fine.
//handleAs: 'json',
//accepts: 'application/json',
The handleAs you need to use only when you have a JSON response. About "accepts" I haven't found what difference between "accept" and "Accept"(inside headers) yet.
Now I can take my informations:
console.log('location: ', response.getHeader('location'));
console.log("status: ", response.status);