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<?php
/**
* Slim Framework (https://slimframework.com)
*
* @license https://github.com/slimphp/Slim/blob/3.x/LICENSE.md (MIT License)
*/
namespace Slim\Interfaces\Http;
use Slim\Interfaces\CollectionInterface;
interface HeadersInterface extends CollectionInterface
{
/**
* Add HTTP header value
*
* This method appends a header value. Unlike the set() method,
* this method _appends_ this new value to any values
* that already exist for this header name.
*
* @param string $key The case-insensitive header name
* @param string|string[] $value The new header value(s)
*/
public function add($key, $value);
/**
* Normalize header name
*
* This method transforms header names into a
* normalized form. This is how we enable case-insensitive
* header names in the other methods in this class.
*
* @param string $key The case-insensitive header name
*
* @return string Normalized header name
*/
public function normalizeKey($key);
}
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