Dietcube\Response::sendHeaders PHP Method

    public function sendHeaders()
    {
        if (headers_sent()) {
            $this->logger || $this->logger->error('Header already sent.');
            return $this;
        }
        $this->sendHttpHeader();
        foreach ($this->headers as $name => $value) {
            $v = implode(',', $value);
            header("{$name}: {$v}", true);
        }
    }