Prefetching

Native

<script type="speculationrules">

{
  "prefetch": [
    {
      "source": "document",
      "where": {
      "href_matches": "/*/",
      "relative_to": "document"
    },
    "eagerness": "immediate"
    }
  ]
}

</script>

Astro

Astro prefetching.

Cloudflare

Cloudflare refuses resources fetched with speculation rules. Tried turning off Speed Brain. Didn't fix it.

Also see: https://community.cloudflare.com/t/cdn-cgi-speculation-applies-even-if-disabled/714033/4.