src/Leevel/Http/HeaderBag.php
public function add(array $elements = []): void
    {
        foreach ($elements as $key => $value) {
            $this->set($key, $value);
        }
    }
public function add(array $elements = []): void
    {
        foreach ($elements as $key => $value) {
            $this->set($key, $value);
        }
    }
{@inheritdoc}