'Authorization' => [
    (int) 0 => 'Digest username="land.com", realm="test", nonce="random", uri="/users/mlogin", qop=auth, nc=, cnonce="", response="52cca0984c1c9e4547d1e01d9ef2a22e", opaque="nochange"'
],

<?php
    namespace AppController;

    use CakeControllerController;
    use CakeEventEvent;

    class AppController extends Controller
    {

        public function initialize()
        {
            parent::initialize();

            $this->loadComponent('RequestHandler', [
                'enableBeforeRedirect' => false,
            ]);
            $this->loadComponent('Flash');

            $this->loadComponent('Auth', [
                'authenticate' => [
                    'Digest' => [
                        'fields' => ['username' => 'username', 'password' => 'digest_hash'],
                        'userModel' => 'Users',

                        'realm' => 'test',
                        'nonce' => 'nonce',
                        // 'qop' => 'auth',
                        'opaque' => 'nochange',

                    ],
                ],
                'storage' => 'Memory',
                'unauthorizedRedirect' => false
            ]);


        }


    }

<?php

    namespace AppModelTable;

    use CakeAuthDigestAuthenticate;
    use CakeEventEvent;
    use CakeORMTable;

    class UsersTable extends Table
    {
        public function beforeSave(Event $event)
        {
            $entity = $event->getData('entity');

            // Make a password for digest auth.
            $entity->digest_hash = DigestAuthenticate::password(
                $entity->username,
                $entity->plain_password,
                'test'
            );
            return true;
        }
    }

    ?>

<?php
    namespace AppController;
    use AppControllerAppController;
    use CakeControllerController;
    use CakeEventEvent;

    class UsersController extends AppController
    {


        function beforeFilter(Event $event) {
            parent::beforeFilter($event);
            $this->Auth->allow( );
        }

        public function mlogin() {

            debug( $this->request->getHeaders() );
            $user = $this->Auth->identify();
            debug( $user );

        }

    }