Private/Polyfony/HttpRequest.php
public function getHeader(string $key) {
		// return the header of null if missing
		return isset($this->response['headers'][$key]) ? 
			$this->response['headers'][$key] : null;
	}
public function getHeader(string $key) {
		// return the header of null if missing
		return isset($this->response['headers'][$key]) ? 
			$this->response['headers'][$key] : null;
	}
public function getHeader ( string $ key ) { // return the header of null if missing return isset ( $ this -> response [ 'headers' ] [ $ key ] ) ? $ this -> response [ 'headers' ] [ $ key ] : null ; }
get a specific response header
get a specific response header