jquery.ajax: fix for beforeSend-cancelling-sideeffects
jquery.ajax: fix for beforeSend-cancelling-sideeffects

praveen9102/Shazam,roytoo/jquery,roytoo/jquery,hoorayimhelping/jquery,batiste/jquery,sancao2/jquery,roytoo/jquery,jquery/jquery,scottjehl/jquery,sancao2/jquery,dtjm/jquery,ilyakharlamov/jquery-xul,diracdeltas/jquery,diracdeltas/jquery,npmcomponent/component-jquery,dtjm/jquery,rwaldron/jquery,jcutrell/jquery,Karyotyper/jquery,diracdeltas/jquery,praveen9102/Shazam,mislav/jquery,fat/jquery,chitranshi/jquery,quiaro/request-agent,isaacs/jquery,kpozin/jquery-nodom,eburgos/jquery,demetr84/Jquery,mislav/jquery,jcutrell/jquery,RubyLouvre/jquery,npmcomponent/component-jquery,gnarf/jquery,rwaldron/jquery,Karyotyper/jquery,Karyotyper/jquery,jquery/jquery,fat/jquery,gnarf/jquery,sancao2/jquery,hoorayimhelping/jquery,chitranshi/jquery,demetr84/Jquery,eburgos/jquery,isaacs/jquery,eburgos/jquery,jquery/jquery,kpozin/jquery-nodom,RubyLouvre/jquery,scottjehl/jquery,batiste/jquery,ilyakharlamov/jquery-xul