laravel api未显示来自请求验证的消息

// routes/api.php
use Illuminate\Support\Facades\Route;
use App\Http\Controllers\ApiController;

Route::post('/submit', [ApiController::class, 'submit']);

// app/Http/Controllers/ApiController.php
namespace App\Http\Controllers;

use Illuminate\Http\Request;
use Illuminate\Validation\ValidationException;

class ApiController extends Controller
{
    public function submit(Request $request)
    {
        // 设置验证规则
        $rules = [
            'name' => 'required|string|max:255',
            'email' => 'required|email|unique:users',
        ];

        // 验证请求数据
        $validatedData = $request->validate($rules);

        // 处理验证通过的数据
        // ...

        return response()->json(['message' => 'Data submitted successfully']);
    }

    // 自定义错误处理
    protected function failedValidation(Validator $validator)
    {
        throw new ValidationException($validator);
    }
}