Lumen開啟StartSession中介軟體後，報錯：Response需要為Object，但是得到的是String

通過以下命令剛安裝的Lumen：

composer create-project laravel/lumen --prefer-dist

做了以下修改：
1、修改 .env 檔案

APP_KEY=iMXwF1A6Vdbg5V8bYzuNbqv0HX6nH9CdSESSION_DRIVER=file

2、修改 bootstrap/app.php 檔案，取消以下代碼的注釋屏蔽：

Dotenv::load(__DIR__.'/../');$app->withFacades();$app->withEloquent(); $app->middleware([     // Illuminate\Cookie\Middleware\EncryptCookies::class,     // Illuminate\Cookie\Middleware\AddQueuedCookiesToResponse::class,      Illuminate\Session\Middleware\StartSession::class,     // Illuminate\View\Middleware\ShareErrorsFromSession::class,     // Laravel\Lumen\Http\Middleware\VerifyCsrfToken::class, ]);

出現以下錯誤提示：

Whoops, looks like something went wrong.1/1ErrorException in StartSession.php line 171:Argument 1 passed to Illuminate\Session\Middleware\StartSession::addCookieToResponse() must be an instance of Symfony\Component\HttpFoundation\Response, string given, called in F:\upupw\vhosts\lumen\vendor\illuminate\session\Middleware\StartSession.php on line 71 and definedin StartSession.php line 171at Application->Laravel\Lumen\{closure}('4096', 'Argument 1 passed to Illuminate\Session\Middleware\StartSession::addCookieToResponse() must be an instance of Symfony\Component\HttpFoundation\Response, string given, called in F:\upupw\vhosts\lumen\vendor\illuminate\session\Middleware\StartSession.php on line 71 and defined', 'F:\upupw\vhosts\lumen\vendor\illuminate\session\Middleware\StartSession.php', '171', array()) in StartSession.php line 171at StartSession->addCookieToResponse('  Lumen       Lumen.     ', object(Store)) in StartSession.php line 71at StartSession->handle(object(Request), object(Closure))at call_user_func_array(array(object(StartSession), 'handle'), array(object(Request), object(Closure))) in Pipeline.php line 124at Pipeline->Illuminate\Pipeline\{closure}(object(Request))at call_user_func(object(Closure), object(Request)) in Pipeline.php line 103at Pipeline->then(object(Closure)) in Application.php line 1354at Application->sendThroughPipeline(array('Illuminate\Session\Middleware\StartSession'), object(Closure)) in Application.php line 1135at Application->dispatch(null) in Application.php line 1073at Application->run() in index.php line 28

然後找到vendor/illuminate/session/Middleware/StartSession.php檔案，添加了調試資訊：
修改 handle() 方法如下：

    public function handle(Request $request, Closure $next)    {        $this->sessionHandled = true;        // If a session driver has been configured, we will need to start the session here        // so that the data is ready for an application. Note that the Laravel sessions        // do not make use of PHP "native" sessions in any way since they are crappy.        if ($this->sessionConfigured()) {            $session = $this->startSession($request);            $request->setSession($session);        }        $response = $next($request);        echo gettype($response) . '
';        // Again, if the session has been configured we will need to close out the session        // so that the attributes may be persisted to some storage medium. We will also        // add the session identifier cookie to the application response headers now.        if ($this->sessionConfigured()) {            $this->storeCurrentUrl($request, $session);            $this->collectGarbage($session);            echo gettype($response) . '
';            $this->addCookieToResponse($response, $session);        }        return $response;    }

輸出顯示：

stringstring

錯誤資訊說 addCookieToResponse 方法第一個參數 需要 Response執行個體，而的到是卻是String，不知如何解決@@

回複內容：

通過以下命令剛安裝的Lumen：

composer create-project laravel/lumen --prefer-dist

做了以下修改：
1、修改 .env 檔案

APP_KEY=iMXwF1A6Vdbg5V8bYzuNbqv0HX6nH9CdSESSION_DRIVER=file

2、修改 bootstrap/app.php 檔案，取消以下代碼的注釋屏蔽：

Dotenv::load(__DIR__.'/../');$app->withFacades();$app->withEloquent(); $app->middleware([     // Illuminate\Cookie\Middleware\EncryptCookies::class,     // Illuminate\Cookie\Middleware\AddQueuedCookiesToResponse::class,      Illuminate\Session\Middleware\StartSession::class,     // Illuminate\View\Middleware\ShareErrorsFromSession::class,     // Laravel\Lumen\Http\Middleware\VerifyCsrfToken::class, ]);

出現以下錯誤提示：

Whoops, looks like something went wrong.1/1ErrorException in StartSession.php line 171:Argument 1 passed to Illuminate\Session\Middleware\StartSession::addCookieToResponse() must be an instance of Symfony\Component\HttpFoundation\Response, string given, called in F:\upupw\vhosts\lumen\vendor\illuminate\session\Middleware\StartSession.php on line 71 and definedin StartSession.php line 171at Application->Laravel\Lumen\{closure}('4096', 'Argument 1 passed to Illuminate\Session\Middleware\StartSession::addCookieToResponse() must be an instance of Symfony\Component\HttpFoundation\Response, string given, called in F:\upupw\vhosts\lumen\vendor\illuminate\session\Middleware\StartSession.php on line 71 and defined', 'F:\upupw\vhosts\lumen\vendor\illuminate\session\Middleware\StartSession.php', '171', array()) in StartSession.php line 171at StartSession->addCookieToResponse('  Lumen       Lumen.     ', object(Store)) in StartSession.php line 71at StartSession->handle(object(Request), object(Closure))at call_user_func_array(array(object(StartSession), 'handle'), array(object(Request), object(Closure))) in Pipeline.php line 124at Pipeline->Illuminate\Pipeline\{closure}(object(Request))at call_user_func(object(Closure), object(Request)) in Pipeline.php line 103at Pipeline->then(object(Closure)) in Application.php line 1354at Application->sendThroughPipeline(array('Illuminate\Session\Middleware\StartSession'), object(Closure)) in Application.php line 1135at Application->dispatch(null) in Application.php line 1073at Application->run() in index.php line 28

然後找到vendor/illuminate/session/Middleware/StartSession.php檔案，添加了調試資訊：
修改 handle() 方法如下：

    public function handle(Request $request, Closure $next)    {        $this->sessionHandled = true;        // If a session driver has been configured, we will need to start the session here        // so that the data is ready for an application. Note that the Laravel sessions        // do not make use of PHP "native" sessions in any way since they are crappy.        if ($this->sessionConfigured()) {            $session = $this->startSession($request);            $request->setSession($session);        }        $response = $next($request);        echo gettype($response) . '
';        // Again, if the session has been configured we will need to close out the session        // so that the attributes may be persisted to some storage medium. We will also        // add the session identifier cookie to the application response headers now.        if ($this->sessionConfigured()) {            $this->storeCurrentUrl($request, $session);            $this->collectGarbage($session);            echo gettype($response) . '
';            $this->addCookieToResponse($response, $session);        }        return $response;    }

輸出顯示：

stringstring

錯誤資訊說 addCookieToResponse 方法第一個參數 需要 Response執行個體，而的到是卻是String，不知如何解決@@

抱歉，剛剛下班回來才看到。

如果直接在路由的回調中返回的確實是 String，如果是在控制器中調用，架構會幫忙把 String 轉為 Response 對象。
當然，在路由回調中我們直接也可以轉一下。prepareResponse方法參見類 Laravel\Lumen\Application：

php$app->get('/', function() use ($app) {    return $app->prepareResponse($app->welcome());});

@Mr_Jing（Lumen 初體驗 文章作者）可以麻煩解答下嗎？

