这是我的ApiController(我为所有api创建)：

use App\User as UserModel;
use App\Fb_friend as FbFriendsModel;
use App\Http\Requests\UserRequest;

class ApiController extends Controller
{

    /**
     * Create a new movie model instance.
     *
     * @return void
     */
    public function __construct(UserModel $user,FbFriendsModel $fb_friends){
        $this->user = $user;
        $this->fb_friends = $fb_friends;
    }
    public function createUser (UserRequest $request) {
      // some code here
    }

路线：

Route::post('createUser',['as' => 'createUser','uses' => 'ApiController@createUser']);

UserRequest.PHP：

public function rules()
    {
        return [
            'fb_id' => 'required|unique:users','username' => 'required|unique:users','email' => 'required|unique:users','image' => 'required','device_id' => 'required','status' => 'required',];
    }

我已覆盖函数Request.PHP以进行错误格式化：

abstract class Request extends FormRequest
{
    protected function formatErrors(Validator $validator)
    {
        return [$validator->messages()->toJson()];
    }
}

当我尝试通过邮递员调用服务时,它返回json格式的错误,但它也打印登录页面,我不明白为什么？