I'm trying to get the server response in 400 status code request, but the second variable is undefined ``` reqwest({ url: 'exampleurl', method: 'post', data: {} }) .then((resp) => { ... }) .fail((err, resp) => { console.log(err, resp) }) ``` the output console is ``` XMLHttpRequest {}, undefined ``` While the server response is a json object, in fails function it's undefined It's a bug?