# robots.txt - non-standard and unknown fields mixed with real rules

User-agent: *
Disallow: /admin/
Noindex: /legacy/            # never standardised; unsupported since 2019
Host: www.example.com        # single-crawler canonical-host hint
Clean-param: ref /catalog/   # single-crawler query-stripping hint
Nofollow: /out/
Disallow-All: yes
X-Made-Up-Field: 1

User-agent: *
Disallow: /tmp/