relayd(8) relay to unix domain socket

Hello,

Is it possible to relay to unix domain socket using relayd(8)?
It seems that relayd(8) only works with protocols on top of IP.

Here is my usecase: I have application server that only able to listen HTTP.
(there are alternatives that work with fastcgi, and I can use them with
httpd(8),
but I want to run this one).

I can make my server listen localhost, but I believe that two servers
running
on same machine should use domain sockets: it is simpler to implement
security
(no need to use pf, I can stay with file permissions to restrict which
processes may access it)
and in theory there is no TCP/IP overhead.

Ilya