gistfile1.js

$.ajaxPrefilter( "+", function( options, originalOptions, jqXHR ) {
    jqXHR.then( null, function( jqXHR, textStatus, errorThrown ) {
        var args = arguments;
        
        return $.Deferred( dfr ) {
            if ( jqXHR.status === 422 ) {
                dfr.resolveWith( this, [ $.parseJSON( jqXHR.responseText ), textStatus, errorThrown ]);
            } else {
                dfr.resolveWith( this, args )
            }
        }.promise();
    }).promise( jqXHR );
});