the most recent update to the W3C's own research webserver, written in Java, called Jigsaw, seems to be dated in 2007. I used it for a lot of purposes until 2002 but I don't know why I stopped working with Jigsaw only that by the time F# emerged in 2004 I was absorbed into a new direction :
iirc Jigsaw was used to develop and validate the WebDAV protocols and XQUERY which at the time I remember thinking XQUERY was sure to be the future as implementations of advanced data management and manipulation and query and distribution and declaration looked to be what the whole point of webservers were for. The incredible distractions caused by "rich media" as opposed to multimedia as it was understood then, are really worth thinking about. Saying that, however, the BBC is doing excellent work on restoring the balance of necessary powers to the network standards engineers https://www.bbc.co.uk/sounds/help/questions/about-bbc-sounds...
https://www.bbc.co.uk/rd/blog/2014-03-media-source-extension...