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/**
* Slim Framework (https://slimframework.com)
*
* @link https://github.com/slimphp/Slim
* @copyright Copyright (c) 2011-2017 Josh Lockhart
* @license https://github.com/slimphp/Slim/blob/3.x/LICENSE.md (MIT License)
*/
namespace Slim\Interfaces\Http;
use Slim\Interfaces\CollectionInterface;
/**
* Headers Interface
*
* @package Slim
* @since 3.0.0
*/
interface HeadersInterface extends CollectionInterface
{
public function add($key, $value);
public function normalizeKey($key);
}