1. headers http header: content-security-policy: prefetch-src

2. headers http header: sec-fetch-dest

3. headers http header: sec-fetch-dest: `fencedframe` value

4. headers http header: sec-fetch-mode

5. headers http header: sec-fetch-site

6. headers http header: sec-fetch-user

7. headers http header: sec-purpose: `sec-purpose` for `<link rel="prefetch">` prefetch

8. headers http header: sec-purpose: `sec-purpose` for `<script type="speculationrules">` prefetch