[ExtJS] Get Server Response in Model.save() or Model.destroy() Failure Callback Function

Many people have the same question: How to get server response in model's failure function? It's easy to get response from server when operation success. But it's a little bit tricky to get response when operation fails. I saw a solution which add a listener to store's proxy to listen on exception event. But I found a easier way below.

model.save({
    success: function (record, operation) {
        // json response from server         
        console.log(operation.response);                  
    },
    failure: function (record, operation) {
        // undefined
        console.log(operation.response); 
        // json response from server
        console.log(operation.request.scope.reader.jsonData);
    }
});