Magento javascript

1/ Magento 2 adds the form key and the isAjax by using jQuery's beforeSend handler

e.g. when calling jQuery.ajax( ); Magento appends the isAjax and form_key like this:

http://fran/FrAdMiN/ordermanager/index/address/?isAjax=true
payload:
city=CHICAGO&street_1=&form_key=epSMoFA7pinmunsA