Nodejs 不提供静态 woff 文件

Question

这是我使用 express server 4.13.4 设置的应用程序：

 /**
 * @param $order
 * @return int
 */
public function gerOrderTotalInCents($order): int
{
    return (int)round($order->info['total'] * 100);
}

/**
 * @param $order
 * @return array
 */
public function getCustomerInfo($order): array
{
    $customer = array_filter([
        'address_type' => 'billing',
        'merchant_customer_id' => (string)$_SESSION['customer_id'],
        'email_address' => $order->customer['email_address'],
        'first_name' => $order->customer['firstname'],
        'last_name' => $order->customer['lastname'],
        'address' => trim($order->billing['street_address'])
            . ' ' . trim($order->billing['suburb'])
            . ' ' . trim($order->billing['postcode'])
            . ' ' . trim($order->billing['city']),
        'postal_code' => $order->billing['postcode'],
        'country' => $order->billing['country']['iso_code_2'],
        'phone_numbers' => [$order->customer['telephone']],
        'user_agent' => $_SERVER['HTTP_USER_AGENT'],
        'ip_address' => $_SESSION['customers_ip_address'],
        'locale' => $_SESSION['languages_code'],
        $this->isRequiredOrderLines() ? $this->getAdditionalCustomerInfo($order) : null
    ]);

    if ($this->isRequiredOrderLines()) {
        $customer = array_merge($customer, $this->getAdditionalCustomerInfo($order));
    }

    return $customer;
}

静态文件夹中的图像文件完美服务。但是当浏览器请求 WOFF 文件时，浏览器有时永远不会完成请求：

（其他两个 WOFF 服务正确）。所有文件都在正确的文件夹中。为什么会发生这种情况？