You may have seen a recent comment, looks like the main page was posted a year ago -- I relied on the URL duplicate checker when submitting it (it was new to me today to come across and I wanted to see thoughts from the HN community on it).

I ran a the search and found the previous:

   A modern, concurrent web server for ruby (puma.io)
   16 points by kachhalimbu 1 year ago | 2 comments | cached