在Laravel中的FormRequest withValidator方法中验证失败

<?php

namespace App\Http\Requests;

use Illuminate\Foundation\Http\FormRequest;
use Illuminate\Contracts\Validation\Validator;
use Illuminate\Validation\ValidationException;

class MyFormRequest extends FormRequest
{
    public function authorize()
    {
        return true;
    }

    public function rules()
    {
        return [
            'name' => 'required',
            'email' => 'required|email',
        ];
    }

    public function withValidator(Validator $validator)
    {
        if ($validator->fails()) {
            throw new ValidationException($validator, $this->redirectRoute());
        }
    }

    protected function redirectRoute()
    {
        return route('my-form');
    }
}