It's a HTML meta tag which can be added to the <head> <meta name="robots" content="noarchive"> EDIT: or it can be added as an X-Header, https://developers.goo

It's a HTML meta tag which can be added to the <head> <meta name="robots" content="noarchive"> EDIT: or it can be added as an X-Header, https://developers.google.com/search/docs/advanced/robots/robots_meta_tag?csw=1 https://developers.google.com/search/docs/advanced/robots/ro... EDIT2: I checked it for 4chan and Instagram, they use the HTML head meta tag.