import type { NextConfig } from "next";

const nextConfig: NextConfig = {
  allowedDevOrigins: ["192.168.100.6"],
  output: "standalone",
  // Files in public/ are served with `Cache-Control: public, max-age=0` by
  // default, because Next.js can't know whether they change. kd-tile.png is
  // hot-linked by an external HTML email signature, so its URL is a fixed
  // contract and its bytes never change — pin it to a long-lived immutable
  // cache so mail clients and their image proxies stop re-fetching it.
  // Headers are matched before the filesystem, so this applies to public/.
  async headers() {
    return [
      {
        source: "/kd-tile.png",
        headers: [
          {
            key: "Cache-Control",
            value: "public, max-age=31536000, immutable",
          },
        ],
      },
    ];
  },
};

export default nextConfig;