103 Early Hints doesn't work even with specified Link in headers

Hi all. Maybe someone can give me a hint. Why 103 Early Hints doesn’t work.

I wrote LINK in the title as it was stated in all the sources that I read.

I crawl my site gdoc io through securityheaders com service. And I don’t get 103 response. Although I found a test site early-hints.fastlylabs com that gets a 103 response through this service.

What could be the problem?

Regards Gus.

I do. Please use this command:

$ curl -X HEAD -I https://gdoc.io
HTTP/2 103
link: <//cdn.ampproject.org>; crossorigin; rel=preconnect, <//www.googletagmanager.com>; rel=preconnect, <//pagead2.googlesyndication.com>; crossorigin; rel=preconnect, <//www.google-analytics.com>; rel=preconnect, <//stats.g.doubleclick.net>; rel=preconnect, <//www.google.com>; rel=preconnect, </assets/js/scripts.js>; as=script; rel=preload, </assets/js/amp-ad-0.1.js>; as=script; rel=preload
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