CakePHP认证插件登录URL不匹配求助（已尝试Router类修复）

遇到错误提示：Login URL /my_app/ did not match /my_app/users/login，已按照Stack Overflow相关方案（使用Router类）尝试修复，但问题仍存在。当前使用的Authentication Plugin版本为2.20.2。

Application.php中getAuthenticationService方法代码 #

public function getAuthenticationService(ServerRequestInterface $request): AuthenticationServiceInterface
{
    $login_url = \Cake\Routing\Router::url('/users/login');
    //dd($login_url) outputs /my_app/users/login

    $service = new AuthenticationService([
        'unauthenticatedRedirect' => $login_url,
        'queryParam' => 'redirect',
    ]);

    //
    $service->loadAuthenticator('Authentication.Session');
    $service->loadAuthenticator('Authentication.Environment', [
        'loginUrl' => $login_url,
        'fields' => [
            // Choose which environment variables exposed by your
            // authentication provider are used to authenticate
            // in your application.
            'HTTP_SAML_EMAIL',
        ],
    ]);

    //
    $service->loadIdentifier('Authentication.Token', [
        'tokenField' => 'email',
        'dataField' => 'HTTP_SAML_EMAIL',
        'resolver' => [
            'className' => 'Authentication.Orm',
            'userModel' => 'Users',
            'finder' => 'authenticatedUser',    //check Users table for custom finder
        ],
    ]);
    return $service;
}

编辑1：Users.login方法代码 #

public function login()
{
    /*
    FAILURE_CREDENTIALS_MISSING - no headers
    FAILURE_IDENTITY_NOT_FOUND - user not found, must be added
    SUCCESS - all good
    */
    
    //get auth status
    $status = $this->Authentication->getResult()->getStatus();

    if($status == 'SUCCESS')    //user found, must update
    {
        //...

        $target = $this->Authentication->getLoginRedirect() ?? \Cake\Routing\Router::url(['controller'=>'Users', 'action'=>'workspace']);
        //debug("a:". $target);
        $this->Flash->success(__('You have successfully logged in'));
        return $this->redirect($target);
    }
    elseif($status == 'FAILURE_IDENTITY_NOT_FOUND') //user not found, must add
    {
        //...

        $target = $this->Authentication->getLoginRedirect() ?? \Cake\Routing\Router::url('/users/workspace');
        //debug("b:". $target);
        $this->Flash->success(__('You have successfully logged in'));
        return $this->redirect($target);
    }
    elseif($status == 'FAILURE_CREDENTIALS_MISSING')
    {
        throw new \Cake\Core\Exception\CakeException(__('Authentication error, missing headers. Please contact system administrators.'), 403);
    }
    else
    {
        //THIS IS WHERE WE'RE AT NOW
        debug($this->Authentication->getResult());
        debug($this->request);

        throw new \Cake\Core\Exception\CakeException(__('Uncaught exception during authentication. Please contact system administrators.'), 500);
    }
}

编辑2：网络追踪信息 #

• /my_app (301)
• /my_app/ (200)（额外的斜杠？）
• /my_app/ (500)（预期内，$this->Authentication->getResult()->getStatus()为FAILURE_OTHER）

疑问：我是否应该在网络追踪中看到/my_app/users/login？请注意我使用环境标头作为认证机制。

内容的提问来源于stack exchange，提问作者TechFanDan