In action on this page
Raw HTML
<meta content="test-marker-123" />
<meta name="robots" content="noindex, nofollow" />
<link rel="octo:index" href="https://octothorp.es/" />
You can flag your page as OK index by outside services if you can’t or don’t want to send the request from the page itself. Without the flag, it won’t be scanned.
Here's what this page has sent to OP
BACKLINKS
<meta content="test-marker-123" />
<meta name="robots" content="noindex, nofollow" />
<link rel="octo:index" href="https://octothorp.es/" />
This page does not send any request to the OP server. However, it includes markup that tells any OP client that scans it that it consents to being scanned by the server it specifies. This is useful if you’re using a system that doesn’t let you add JavaScript, edit the head of the document, or if you want to make an OP client that indexes pages at its own cadence.
AND
It includes a custom marker that an OP client can use as an additional flag to allow indexing. It can even use standard “robots” flags like
noindex,nofollow, which would normally prevent it from being indexed.