Laravel Passport不通过Postman做出回应

请参阅以下USERCONTROLLER的代码。IAM尝试使用 VUEJS 通过 api ..因此，我创建了路由寄存器，并在API.php 上登录。用于测试我尝试通过Postman 和通过 http：//localhost：8000/api/寄存器使用接受> with Application with应用程序，/json 。我正在通过身体作为形式数据传递数据。问题在于，当我尝试发送数据邮递员时，请连续发送数据，并且当我取消请求时，端口8000不再工作。因此，我必须停止服务器并再次运行。谁能告诉我我的代码中有任何错误。im使用laravel 5.7

<?php
namespace AppHttpControllersApi;
use AppUser;
use IlluminateHttpRequest;
use AppHttpControllersController;
use GuzzleHttpClient;
use IlluminateSupportFacadesHash;
class UserController extends Controller
{
   public function  register(Request $request){
       $request->validate([
          'name' => 'required',
          'email'=> 'required',
          'password'=> 'required'
       ]);
       //add some cde that what happen if validation fils
       $newUser = User::firstOrNew(['email'=> $request->email]);
       $newUser->name = $request->name;
       $newUser->email =$request->email;
       $newUser->password = bcrypt($request->password);
       $newUser->save();
        $http = new Client;
        $response = $http->post(url('oauth/token'), [
            'form_params' => [
                'grant_type' => 'password',
                'client_id' => '2',
                'client_secret' => '9J0sU4Ctz5p3AUz7ROiv7jELnGrU5waepprqICyH',
                'username' => $request->email,
                'password' => $request->password,
                'scope' => '',
            ],
        ]);
        return response(['data' => json_decode((string)$response->getBody(), true) ]) ;
       }
   public function login(Request $request){
        $request->validate([
            'email'=> 'required',
            'password'=> 'required'
       ]);
       $user = User::where('email', $request->email)->first();
       if(!$user){
           return response(['status' => 'error' , 'message'=> 'user not found']);
       }
       if(Hash::check($request->password, $$user->password)){
            $http = new Client;
            $response = $http->post(url('oauth/token'), [
                'form_params' => [
                    'grant_type' => 'password',
                    'client_id' => '2',
                    'client_secret' => '9J0sU4Ctz5p3AUz7ROiv7jELnGrU5waepprqICyH',
                    'username' => $request->email,
                    'password' => $request->password,
                    'scope' => '',
                ],
            ]);
            return response(['data' => json_decode((string)$response->getBody(), true)]);
       }
   }
}