Must I To Disable Csrf Validation On Ajax Request?

Hi folks.

Well, I have this scenario:

I have two little apps, one powered by Qooxdoo, and the other by ExtJS 4.

This apps lives standalone, and they do POST AJAX request.

So, in a normal scenario Yii provides a hidden field with _csrf toket for POST request, but, this apps do not have that hidden field.

Well, the easy solution for do not get a 400 Bad Request error for me is disable the CSRF validation for Ajax request.

Anyway, some of you have a elegant idea for keep the CSRF validation enabled for my scenario?