我想问您如何在前端接收/显示在后端生成的错误消息。
在java spring后端中，类似于：

return new ResponseEntity<>(new Exception("This is what I want to show in the front"), HttpStatus.CONFLICT);

在vue.js前端，类似这样的内容：

axios.post(registerUrl, formData, backendOptions).then(
    response => {                   
        console.log(response.data); //Irrelevant for this example
    }).catch(err => {
        console.log(err); 
            //Displays 'Error: Request failed with status code 409'
            //Instead of: 'This is what I want to show in the front'
    });

谢谢！