Cloudflare Pages: Dynamic sitemap index + correct XML serving

This package fixes invalid XML responses and auto-builds sitemap_index.xml at runtime by scanning which sitemap_small*.xml files exist.

What it does

• Forces correct headers for all sitemap*.xml and robots.txt.
• Serves them as static assets (no SPA/HTML preload).
• Dynamically generates /sitemap_index.xml by probing sitemap_small1..300.xml and also root sitemap{1,2,3}.xml. Adjust the range in _worker.js if needed.

Install

1. Put _worker.js, _headers, _routes.json, robots.txt in your repo root.
2. Commit & deploy to Cloudflare Pages.

Verify

curl -I https://<your-domain>/sitemap_small1.xml   # Content-Type: application/xml
curl -I https://<your-domain>/sitemap_small41.xml  # Content-Type: application/xml
curl -I https://<your-domain>/robots.txt           # Content-Type: text/plain
curl    https://<your-domain>/sitemap_index.xml    # Should contain entries for all existing sitemaps

If you have more than 300 small files, bump SMALL_MAX in _worker.js.