I've just released iocaine 3.6.0, and it is likely going to be the last release of #iocaine on the 3.x branch.
If you're using Nam-Shub of Enki, there's not much in this release for you - but I did fix a number of issues on that side, too.
If you're using the built-in script, this release updates the ai.robots.txt shipped with iocaine, adds a workaround for a few bots in it that were too generic, and will let Websocket upgrade requests through.
It also lets you manage the firewall table & rules yourself, in which case iocaine will only add to the sets, and otherwise not touch firewall stuff.