« Canonical tags & meta robots directives

X-Robots-Tag header

This response carries an X-Robots-Tag: noindex, nofollow HTTP header instead of a meta tag. It has the same meaning as the meta-tag equivalents above, but it works on any response, not just HTML: a PDF, an image, or a JSON file can't carry a <meta> tag, but they can carry this header. Check this page's response headers to see it.