gistfile1.js

(function( $ ) {
    var createXhr = $.ajaxSettings.xhr;
    
    $.ajaxSettings.xhr = function() {
        var xhr = createXhr(),
            setRequestHeader = xhr.setRequestHeader;
            
        xhr.setRequestHeader = function( name ) {
            if ( name !== "X-Requested-With" ) {
                return setRequestHeader.apply( xhr, arguments );
            }
        };
        
        return xhr;
    };
}( jQuery ));