HTTP proxy in OpenBSD 5.8 (replacing Apache ProxyPass)

I'm trying to replace Apache with OpenBSDs httpd but can't figure out what to do with my ProxyPass statements. In apaches conf it looks like this ProxyPass /someurl http://192.168.123.123/someotherurl ProxyPassReverse /someurl http://192.168.123.123/someotherurl - I thought I should use relayd for this, but how do I do the URL rewrite? - Would I set up relayd to listen on port 80 and forward some things to different internal machines and the rest to httpd on localhost?