jqXHR.abort() in $.ajaxPrefilter doesn't work as should be.

In fact, abort method just stop passing json data further, but it does a call to a server and get real response, but it shoudn't...

As a fix, I use

    $.ajaxSetup({
      beforeSend: function(jqXHR, settings) {
          jqXHR.abort();
      }
   });

to really abort ajax request to a server.