I am developing an API using CakePHP 3 framework. Now I'm sending a GET request from POSTMAN client. User will pass an API key in the header.

I wanna fetch this header in my controller function.

This is how my controller looks like

namespace Api\Controller;
use Cake\Auth\DefaultPasswordHasher;
use Api\Controller\AppController;
use Cake\Cache\Cache;
use Cake\Http\ServerRequest;

class ApiController extends AppController
{
    public function initialize()
    {
        parent::initialize();
        $this->loadComponent('RequestHandler');
    }

    public function myinfo()
    {
        if($this->request->is('get')) { 
            $key = $this->request->getHeaderLine('Authorization');
            $this->set('key', $key);
        }
        $this->set('_serialize', ['key']);          
    } 
}

The error that I'm getting is: HeaderLine is not a function

I also tried some more options:

$acceptHeader = $this->request->getHeader('Authorization');

but this also threw similar error. Header is not a function.

Reference: Link

CakePHP version: 3.3.5