I'm not so convinced about the result, but nevertheless impressed by the answer. Also, I didn't quite get what the 'open' part in openai.com is...
internet.nl checks websites and email server for their use of modern Internet standards such as HTTPS, DANE, HSTS, DMARC, etc.
Recently, a check for security.txt according to RFC9116 was added. The idea is to make it easier to report
security vulnerabilities. Previously, RFC2142 (section 4)
suggested the use of
Another check is for RPKI (Resource Public Key Infrastructure), aiming to make Internet routnig more secure. It is moreless directed at ISPs operating for securing BGP.
There's yet another proposal for embedded representation of a URL on 3rd party sites, see my previous post on Open Graph and JSON:LD.
oEmbed allows a website to display embedded content (e.g. photos or videos) when a user posts a link. Contrary to the other approaches, oEmbed requires implementation of a dedicated service endpoint (i.e. not simply some
meta HTML tags). It seems to be used by WordPress and Slack (at least the later also can do alternatives).
The act of obtaining embedded information seems to be called 'unfurling' (improving preview of an URL).
The thema can be chosen by configuring e.g.
thema: minima in
_config.yml. What theme does Github apply by default, i.e. when not explicitly setting a theme? Impossible to find out.
Also, I'd recommend using
remote_theme: jekyll/minima, so that Jekyll uses current theme code as hosted in the minima repository (or so they say).
A lot of trial-and-error goes into finding a working setup, e.g. to disable plugins (or find out which are auto-magically enabled), overriding config, etc.
Android has interesting expectations for an IP address...
Each of the four octets should be 0 to 255 (last the I checked). :-)