The GH issues hint this is not maintained? The site itself seems to be working, though.<p>Although since recently I have been using <a href="https://github.com/technoboy10/crossorigin.me" rel="nofollow">https://github.com/technoboy10/crossorigin.me</a> without any downtimes or ssl issues. (I am not related to any of the two projects in any way, though.)