protected function getInitHeaders(): array
    {
        // Initial payload consists of required headers for Wildfire
        return array_merge(
            $this->createHeader(['Protocol', 1], static::PROTOCOL_URI),
            $this->createHeader([1, 'Structure', 1], static::STRUCTURE_URI),
            $this->createHeader([1, 'Plugin', 1], static::PLUGIN_URI)
        );
    }