public function headers(): Headers
    {
        return !is_null($this->headers) ? $this->headers : ($this->headers = new Headers());
    }
public function headers(): Headers
    {
        return !is_null($this->headers) ? $this->headers : ($this->headers = new Headers());
    }
public function headers ( ) : Headers { return ! is_null ( $ this -> headers ) ? $ this -> headers : ( $ this -> headers = new Headers ( ) ) ; }
Retrieve object's headers

@return Headers
Retrieve object s headers