if( jQuery.ajaxPrefilter ) {
    jQuery.ajaxPrefilter(function( options, _, xhr ) {
        var port = settings.port;
        if( settings.mode === "abort" ) {
            if ( pendingRequests[port] ) {
               pendingRequests[port].abort();
            }
                pendingRequests[port] = xhr;
        }
    });
} else {
    (function($) {
        var ajax = $.ajax;
        var pendingRequests = {};
        $.ajax = function(settings) {
            // create settings for compatibility with ajaxSetup
            settings = $.extend(settings, $.extend({}, $.ajaxSettings, settings));
            var port = settings.port;
            if (settings.mode == "abort") {
                if ( pendingRequests[port] ) {
                    pendingRequests[port].abort();
                }
                return (pendingRequests[port] = ajax.apply(this, arguments));
            }
            return ajax.apply(this, arguments);
        };
    })(jQuery);
}